WO2012130071A1 - 一种资源调度方法和设备 - Google Patents
一种资源调度方法和设备 Download PDFInfo
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- WO2012130071A1 WO2012130071A1 PCT/CN2012/072773 CN2012072773W WO2012130071A1 WO 2012130071 A1 WO2012130071 A1 WO 2012130071A1 CN 2012072773 W CN2012072773 W CN 2012072773W WO 2012130071 A1 WO2012130071 A1 WO 2012130071A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/12—Wireless traffic scheduling
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/06—Optimizing the usage of the radio link, e.g. header compression, information sizing, discarding information
Definitions
- the application date of this application 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 all the contents of the prior application are It has been embodied in this application.
- the present invention relates to a wireless communication network or, in particular, to a wireless communication network or, in particular, to a method and device for resource scheduling. Background technique
- wireless communication systems for medium and short communication distances include wireless office i or network WiFi technology based on the 802.11 standard, Bluetooth Bluetooth system based on 802.15, and Femto technology for indoor applications derived from mobile communication systems. .
- 802.11-based WiFi technology is one of the most widely used wireless network transmission technologies. 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 802.11b to OFDM-based 802.11a and 802.11g. In the latest 802.11n version, the 802.11 ⁇ physical layer peak rate is up to 600Mbps by introducing multi-antenna ( ⁇ ) technology.
- CSMA/CA Carrier Sense Multiple Access with Collision Avoidance
- the ten-party discussion uses the "competition" mechanism, and the access point CAP and each terminal or STA obtain the open air interface usage right through competition. In the course of its success, the air interface will be exclusively used by the successful CAP. Due to the competitive mechanism, the access network does not need to centrally control the nodes. Whether it is CAP or STA in the competition for air resources The WiFi system is less efficient and wastes wireless resources.
- the root cause of this problem is that the CSMA/CA mechanism is a contention-based random multiple access mechanism, access point (CAP, Access). Point) and the station (STA, Station), or between different STAs, will compete for the use of radio resources through the CSMA/CA mechanism, and compete for the wireless channel.
- the CSMA/CA mechanism requires that the CAP or STA need to randomly retreat when competing for the wireless channel.
- the wireless channel is idle. But it is not used, which is also a great waste of the wireless channel.
- the 802.11 system is less efficient. For example: 802.
- the 802.11 system is flexible and does not rely on centralized control mechanisms. Therefore, it is also possible to 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.
- Femto base stations called pico base stations, are 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 only combines its limited coverage, fewer access users and other application scenarios, which reduces the processing power of the device and reduces 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 cause a certain waste of resources when the FDD system faces the data service.
- the uplink and downlink of the TDD system work on the same carrier, and the time-resource resources are allocated to allocate different radio resources to the uplink and downlink. Therefore, the FDD can better adapt to the asymmetric data service of the uplink and downlink services.
- the TDD duplex mode of the mobile communication system including the Femto system
- the 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 ), etc.
- Wi-Fi since 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 competition conflict and random backoff, so the link efficiency is high.
- Femto technology its multiple access mechanism allocates mutually orthogonal access resources to different STAs by time, frequency and codeword, which is oriented to The competitive CSMA/CA random multiple access is essentially different.
- the 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, and the Femto technology for the LTE or WiMAX system uses the OFDM transmission mechanism. Since OFDM technology is the mainstream technology of future broadband wireless communication systems, the Femto technologies mentioned in the present invention all refer to LTE or WiMAX Femto.
- 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, the 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.
- both the Wi-Fi system based on 802.11 technology and the Femto technology derived from the mobile communication system have some shortcomings.
- CSMA/CA is a multi-access mechanism for competition. Inevitably there will be conflicts in the system. If two or more terminals, or the terminal and the CAP compete for the air interface at the same time, neither party will compete for success. This is a competition conflict. Obviously, the conflict 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. During the backoff process, there will be multiple situations where the competing nodes are waiting.
- the scheduling period lms is the minimum configuration unit.
- the asymmetric characteristics of the uplink and downlink 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 initially configured. 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. Summary of the invention
- the technical problem to be solved by the present invention is to provide a method and a device for resource scheduling, which are not subject to frame format and frame length, can dynamically allocate resources based on transmission requirements, and can also be better dynamic. It adapts to the needs of the data services with rich variety and different characteristics in the future, and has good scalability.
- a summary of the cartridges is given below. This generalization is not a general comment, nor is it intended to identify key/important elements or to describe the scope of protection of these embodiments. Its sole purpose is to present some concepts in the form of a single sheet as a preface to the following detailed description.
- the present invention provides a resource scheduling method, including: performing resource scheduling according to transmission requirements;
- the present invention further provides a resource scheduling device, including: a scheduling module, configured to perform resource scheduling according to a transmission requirement;
- the configuration module configures a frame length non-fixed frame structure that matches the scheduled resource.
- the CAP centrally schedules its associated STAs to allocate radio resources to different STAs, thereby avoiding the waste of radio resources caused by the competition mechanism.
- the frame structure is flexible.
- 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 the change of time selective fading of the wireless channel, avoiding the control overhead caused by unnecessary frequent scheduling; the system allows the frame length to be dynamically adjusted to adaptive wireless channel time selective fading, and the system scheduling period can be Matching with the wireless channel, thereby reducing the control overhead caused by frequent scheduling. Has a high throughput and wireless resource utilization.
- one or more embodiments include the features that are described in detail below and particularly pointed out in the claims.
- the following description and the annexed drawings are intended to illustrate certain exemplary aspects, Other advantages and novel features will become apparent from the Detailed Description of the Drawing.
- FIG. 1 is a schematic flowchart of a resource scheduling method provided by the present invention
- FIG. 2 is a schematic diagram of a frame structure according to an embodiment of the present invention
- FIG. 3 is a schematic diagram of another frame structure according to an embodiment of the present invention
- FIG. 4 is a schematic diagram of another frame structure according to an embodiment of the present invention.
- FIG. 5 is a flowchart of a method for scheduling a line according to an application example of the present invention.
- FIG. 6 is a schematic diagram of a line scheduling process of an application example of the present invention.
- FIG. 7 is a flowchart of a method for downlink scheduling of an application example 2 of the present invention
- FIG. 8 is a schematic diagram of a downlink scheduling process of application example 2 of the present invention
- FIG. 9 is a flowchart of a third uplink scheduling method according to an application example of the present invention.
- FIG. 10 is a schematic diagram of an uplink scheduling process of an application example of the present invention.
- FIG. 11 is a flowchart of an uplink scheduling method of an application example of the present invention.
- FIG. 12 is a schematic diagram of an uplink scheduling process of an application example of the present invention.
- FIG. 13 is a schematic diagram of a fifth uplink and downlink scheduling transmission process according to an application example of the present invention
- FIG. 14 is a block diagram of an apparatus for resource scheduling equipment according to a second embodiment of the present invention
- 15 is a schematic structural diagram of a wireless communication system according to a third embodiment of the present invention
- FIG. 16 is a schematic structural diagram of a network device according to a third embodiment of the present invention
- FIG. 17 is a schematic structural diagram of a terminal device in a third embodiment of the present invention.
- FIG. 18 is a schematic structural diagram of a physical frame in the sixth application example of the present invention.
- FIG. 19 is a schematic structural diagram of a physical frame in the seventh application example of the present invention.
- Figure 20a is a first structural diagram of the first physical frame in the eighth application example of the present invention
- Figure 20b is a schematic structural diagram of the second physical frame in the eighth application example of the present invention
- FIG. 21 is a second schematic structural diagram of a first physical frame in the eighth application example of the present invention.
- FIG. 22 is a schematic structural diagram of a second physical frame in the application example 9 of the present invention.
- FIG. 23 is a schematic structural diagram of a physical frame in an application example 10 of the present invention
- FIG. 24 is a schematic structural diagram of a physical frame in an application example 11 of the present invention
- FIG. 25 is a schematic structural diagram of a physical frame in an application example 12 of the present invention
- FIG. 26 is a schematic structural diagram of a physical frame in an application example 13 of the present invention
- FIG. 27 is a schematic structural diagram of a physical frame in the application example 14 of the present invention
- FIG. 28 is a schematic diagram of an uplink protection interval reserved in advance by CAP transmission in the application example 14 of the present invention
- FIG. 29 is a physical frame in the fifteenth application example of the present invention. Schematic diagram of the structure;
- FIG. 30 is a schematic diagram of an uplink transmission channel, an uplink scheduling request channel, and an uplink random access channel multiplexing resource in the fifteenth application example of the present invention
- Figure 31 is a diagram showing the control channel and system information channel multiplexing resources in the fifteenth application of the present invention.
- FIG. 32 is a schematic diagram of downlink signaling/feedback transmission channel multiplexing DL-TCH resources;
- FIG. 33 is a schematic structural diagram of a first uplink signaling/feedback channel;
- FIG. 34 is a schematic structural diagram of a second uplink signaling/feedback channel
- FIG. 35 is a schematic diagram of a method for generating an uplink scheduling request channel
- FIG. 36 is a sequence of a maximum length linear feedback shift register of a PN sequence
- FIG. 37 is a format of a first type of uplink random access channel
- 38 is a format of a second uplink random access channel
- Figure 39 is a format of a third uplink random access channel.
- Step S101 Perform resource scheduling according to transmission requirements.
- Step S102 Configure a non-fixed frame structure with a frame length matched with the scheduled resource.
- the method of the present invention does not have a waste of radio resources caused by conflict of competition 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), according to the direction of data transmission, TDD A frame can be divided into two parts: downlink (DL, Downlink, from base station to terminal or from CAP to STA direction) and uplink (UL, Uplink, from terminal to base station or from STA to CAP direction).
- the frame length can be dynamically configured and the frame structure can be dynamically configured. That is, in the present invention, resource scheduling is performed according to transmission requirements, and the frame format is determined by the scheduled resources.
- the resource scheduling process is not limited by the frame length and the frame format, and the resource allocation is more reasonable. The following will specifically explain how to perform resource scheduling according to the transmission needs and configure the frame structure accordingly.
- Embodiment 1 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 frame structure provided by the present invention includes a downlink subframe and/or an uplink subframe, and the downlink subframe and the uplink subframe divide different channels according to functions.
- the protection interval GI is between the downlink subframe and the uplink subframe, and the transmission and reception protection interval between the downlink and the uplink is called the downlink protection interval DGI, and the uplink to downlink transmission and reception protection interval is called the uplink protection interval UGI.
- the frame structure provided by the present invention is configured with at least a preamble sequence and a system information channel, where: the preamble sequence is disposed at a starting position of the frame structure, and is used for implementing synchronization.
- the leader sequence can be divided into a short leader sequence and a long leader 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;
- long preamble sequence is mainly used for system fine synchronization and channel estimation, and also used for fine frequency synchronization, Fine symbol synchronization, etc.
- the system information channel is configured to carry information indicating a frame structure. By detecting the information indicating the frame structure on the system information channel, all STAs associated with the CAP can obtain the structure of the frame.
- the system information channel is located after the preamble sequence, and its location is pre-agreed by the CAP and the STA.
- the system information channel is also used to broadcast basic system configurations, such as CAP identification, CAP antenna configuration, frame numbering, CRC check protection information, and the like.
- the transmission requirement is carried by the scheduling information, and the CAP obtains and parses the scheduling information to obtain a transmission requirement, and completes the resource scheduling.
- the uplink transmission requirement is obtained by the CAP from the STA.
- the CAP can obtain the uplink transmission requirement in the following three manners: The first type: obtains the uplink transmission requirement by using the request-response mode, specifically: the STA initiates a scheduling request, and the CAP allocates a feedback uplink transmission to the STA. For the required resource, the STA feeds back the uplink transmission request on the corresponding resource; if the first mode is used, the uplink scheduling request channel needs to be configured in the frame structure, and the STA sends the uplink scheduling to the CAP. Request to request a transmission resource for reporting the uplink transmission requirement to the CAP.
- the STA may be configured to allocate an exclusive uplink transmission resource for the STA to initiate uplink scheduling in a non-contention manner, and may also schedule the shared uplink transmission resource for the STA to be used by the STA.
- the competition method initiates uplink scheduling. That is, the STA initiates a scheduling request, and may use a collision-free uplink transmission request mechanism or use a contention-based uplink transmission request mechanism.
- the duration of the uplink scheduling request channel is calculated and configured according to the number of STAs associated with the CAP. For example, N uplink scheduling request channels may be allocated to the N STAs associated with the CAP, and each STA may initiate an uplink scheduling request based on the collision-free uplink transmission request mechanism on the corresponding channel.
- the M STAs associated with the CAP may be allocated with M uplink scheduling request channels, where M is smaller than N, and the N STAs compete for the M uplink scheduling request channels to initiate an uplink scheduling request.
- the uplink scheduling request channel may also be designed to be used for feedback switching information, thereby implementing fast feedback.
- the second type The uplink transmission requirement is obtained by the polling method.
- the CAP periodically polls the STAs and receives the uplink transmission requirements fed back by the STA.
- the third type obtains the uplink transmission requirement by carrying the report, specifically: STA is transmitting When the uplink service is transmitted, the uplink transmission requirement is carried in the data frame and sent to the CAP along with the uplink service.
- the downlink transmission requirement is obtained from a MAC layer or a high layer of the CAP.
- the transmission requirements may be classified into an uplink transmission requirement and a downlink transmission requirement according to a transmission direction.
- the uplink resource When there is an uplink transmission requirement, the uplink resource is scheduled according to the uplink transmission requirement, and the uplink transmission channel matching the scheduled uplink resource is configured.
- the downlink resource When there is a downlink transmission requirement, the downlink resource is scheduled according to the downlink transmission requirement, and the downlink transmission channel matching the scheduled downlink resource is configured.
- the transmission requirements are classified according to the type of data transmitted, and the requirements for transmitting service data, the requirements for transmitting signaling, and feedback requirements.
- the scheduling the uplink transmission resource according to the uplink transmission requirement, and configuring the matched uplink transmission channel may further include:
- an uplink transmission resource is scheduled for the uplink service, and an uplink service transmission channel is configured in the frame structure.
- the duration of the uplink traffic transmission channel is determined according to the total transmission resources required for each STA associated with the CAP to transmit the uplink service.
- an uplink transmission resource is scheduled for the uplink signaling, and an uplink signaling channel is configured in the frame structure.
- the duration of the uplink signaling channel is determined according to the total transmission resources required by each STA associated with the CAP to transmit uplink signaling.
- the uplink transmission resource is scheduled for the downlink service feedback, and the downlink service feedback channel is configured accordingly.
- the duration of the downlink service feedback channel is determined according to the total transmission resource required for each STA associated with the CAP to feed back the downlink service. If there are other uplink transmission requirements, a corresponding channel may be added to the uplink transmission channel, and the present invention will not be described in detail herein.
- the scheduling the downlink transmission resource according to the downlink transmission requirement, and configuring the matched downlink transmission channel may further include:
- the downlink transmission resource is scheduled for the downlink service, and the downlink service transmission channel is configured in the frame structure.
- the duration of the downlink traffic transmission channel is determined according to the total transmission resources required by the CAP to transmit downlink traffic to each STA associated with it.
- downlink transmission resources are scheduled for the downlink signaling, and a downlink signaling channel is configured in the frame structure.
- the duration of the downlink signaling channel is determined according to the total transmission resources required by the CAP to transmit downlink signaling to each STA associated with it.
- the downlink transmission resource is scheduled for the uplink service feedback, and the uplink service feedback channel is configured accordingly.
- the duration of the uplink service feedback channel is determined according to the total transmission resource required by the CAP to feed back the uplink service to each STA associated with the CAP. If there are other downlink transmission requirements, the corresponding channel may be added to the downlink transmission channel, and the present invention will not be described in detail herein.
- Resource allocation may be performed according to channel quality information CQI, or resource allocation may be performed according to CQI and channel state information CSI.
- the CSI is an H matrix of the transmission channel (NxM order, N receiving antennas, M transmitting antennas;), or a V matrix of the H matrix of the transmission channel after SVD decomposition ( ⁇ order;), or compression of the V matrix Information;
- CQI includes one or more of the following: SNR (signal-to-noise ratio) or SINR (signal-to-noise ratio;) of the transport channel, MCS (modulation code set 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 CAP When the STA's capability supports the CAP to acquire the CQI, the CAP also acquires the CQI, and performs resource scheduling according to the transmission requirements and the CQI.
- the capability of the STA supports the CAP to obtain the CQI and the CSI
- the CAP also acquires the CQI and the CSI, and performs resource scheduling according to the transmission requirement, the CQI, and the CSI.
- the CQI may be a CQI obtained by measuring an entire frequency band, or may be a CQI obtained by measuring a partial frequency band.
- the CSI may be a CSI obtained by measuring the entire frequency band, or may be a CSI obtained by measuring a partial frequency band.
- Mode 1 Calculate according to the uplink sounding channel. That is, when there is a demand for scheduling uplink transmission resources, for example, when there is a demand for transmitting an uplink service, a requirement for transmitting uplink signaling, or a request for feedback of a downlink service, resource scheduling for acquiring an uplink CQI is also required, and An uplink sounding channel is configured in the frame structure for the STA to send an uplink sounding signal to the CAP.
- the uplink channel quality information CQI is calculated by measuring the uplink sounding signal on the uplink sounding channel, and the resource scheduling is performed according to the measured uplink CQI.
- Manner 2 Using the upper and lower reciprocity of the TDD system, the STA measures and feeds back the downlink CQI.
- the CAP obtains the uplink CQI based on the system reciprocity. That is, when there is an uplink transmission requirement, resource scheduling needs to be performed for acquiring the uplink CQI, and a downlink sounding channel and a CQI feedback channel are configured in the frame structure, and the downlink sounding channel is used for the CAP to send the downlink to the STA.
- the CQI feedback channel is used by the STA to feed back the CQI of the downlink measured by the downlink sounding signal to the CAP.
- the CAP schedules the uplink transmission resource according to the uplink transmission requirement
- the CAP is based on the uplink and the reciprocity, and the downlink CQI is fed back according to the STA.
- the uplink CQI is determined, and the uplink transmission resource is scheduled in combination with the uplink CQI.
- resource scheduling may also be performed according to uplink CQI and CSI.
- Mode 1 Calculate according to the uplink sounding channel. That is, when there is a demand for scheduling uplink transmission resources, for example, when there is a demand for transmitting an uplink service, a requirement for transmitting uplink signaling, or a request for feedback of a downlink service, it is also necessary to obtain an uplink CQI and an uplink CSI.
- Resource scheduling and configuring an uplink sounding channel in the frame structure for the STA to send an uplink sounding signal to the CAP.
- the uplink channel quality information CQI and CSI are calculated by measuring the uplink sounding signal on the uplink sounding channel, and combined with the measured uplink CQI and The uplink CSI performs resource scheduling.
- Manner 2 Using the upper and lower reciprocity of the TDD system, the STA measures and feeds back the downlink CQI and the downlink CSI.
- the CAP obtains the corresponding uplink CQI and uplink CSI based on the system reciprocity. That is, when there is an uplink transmission requirement, resource scheduling needs to be performed for acquiring the uplink CQI and the uplink CSI, and the downlink sounding channel, the CQI feedback channel, and the CSI feedback channel are configured in the frame structure, and the downlink detection is performed.
- the channel is used by the CAP to send a downlink sounding signal to the STA.
- the CQI feedback channel is used by the STA to feed back the CQI of the downlink measured according to the downlink sounding signal to the CAP.
- the CSI feedback channel is used for the STA to feed back the CAP according to the downlink sounding signal.
- Method 3 Use the direct measurement method to obtain the CQI, and use the system reciprocity to obtain the CSI; or use the direct measurement method to obtain the CSI, and use the system reciprocity to obtain the CQI.
- resource scheduling is also performed for acquiring the uplink CQI and the uplink CSI, and the uplink sounding channel, the downlink sounding channel, and the CQI feedback channel are configured in the frame structure, and the uplink sounding channel is used.
- the station STA sends an uplink sounding signal to the central access point CAP, where the downlink sounding channel is used by the CAP to send a downlink sounding signal to the STA, and the CQI feedback channel is used by the STA to feed back the CQI measured by the downlink sounding signal to the CAP.
- the uplink sounding signal is measured on the uplink sounding channel, the uplink channel quality information CSI is calculated, and the uplink CQI is determined according to the downlink CQI fed back and forth by the STA based on the upper and lower reciprocity. And scheduling uplink transmission resources in combination with the uplink CQI and the uplink CSI.
- the resource scheduling is performed for acquiring the uplink CQI and the uplink CSI, and the uplink sounding channel, the downlink sounding channel, and the CSI feedback channel are configured in the frame structure, where the uplink sounding is performed.
- the channel is used by the station STA to send an uplink sounding signal to the central access point CAP, where the downlink sounding channel is used by the CAP to send a downlink sounding signal to the STA, and the CSI feedback channel is used by the STA to feed back the downlink measured by the downlink sounding signal to the CAP.
- the CSI is configured to measure the uplink sounding signal on the uplink sounding channel, calculate the uplink channel quality information CQI, and determine the downlink CSI based on the upper and lower reciprocity based on the STA feedback when scheduling the uplink transmission resource according to the uplink transmission requirement.
- the uplink CSI is combined with the uplink CQI and the uplink CSI to schedule uplink transmission resources.
- resource scheduling may be performed according to the downlink CQI.
- the following design can be used:
- Method 1 The upper and lower reciprocity of the TDD system can be utilized, and the downlink CQI is calculated by the CAP. Specifically, when there is a requirement for scheduling downlink transmission resources, for example, when there is a requirement for transmitting a downlink service, a requirement for transmitting downlink signaling, or a requirement for feedback of an uplink service, resource scheduling for acquiring a downlink CQI is also required. And configuring an uplink sounding channel in the frame structure for the STA to send an uplink sounding signal to the CAP.
- the uplink CQI is calculated by measuring the uplink sounding signal on the uplink sounding channel, determining the downlink CQI based on the uplink and downlink reciprocity of the TDD system, and performing resources according to the downlink CQI.
- Scheduling. Manner 2 The downlink CQI can be measured by the STA, and the measurement result is reported to the CAP by means of feedback, so that the CAP obtains the downlink CQI.
- resource scheduling for acquiring a downlink CQI is also required. And configuring a downlink sounding channel and a CQI feedback channel in the frame structure, where the downlink sounding channel is used by the CAP to send a downlink sounding signal to the STA, and the CQI feedback channel is used for the STA to report back to the CAP according to the downlink sounding signal. The downstream CQI.
- the resource scheduling is performed according to the downlink CQI fed back by the STA.
- the duration of the uplink sounding channel may be determined according to the total number of antennas of the STA that reports the uplink sounding signal.
- resource scheduling may also be performed according to downlink CQI and CSI.
- Method 1 The upper and lower reciprocity of the TDD system can be utilized, and the downlink CQI and CSI are calculated by the CAP.
- it is also required to acquire a downlink CQI and a downlink.
- the CSI performs resource scheduling, and accordingly, an uplink sounding channel is configured in the frame structure, and is used by the STA to send an uplink sounding signal to the CAP.
- the uplink CQI and the uplink CSI are calculated by measuring the uplink sounding signal on the uplink sounding channel, and the downlink CQI and the downlink CSI are determined based on the uplink and downlink reciprocity of the TDD system.
- the downlink CQI and the downlink CSI perform resource scheduling. Manner 2:
- the downlink CQI and the downlink CSI can be measured by the STA, and the measurement result is reported to the CAP in a feedback manner, so that the CAP obtains the downlink CQI and the downlink CSI.
- the CSI performs resource scheduling, and the downlink sounding channel, the CQI feedback channel, and the CSI feedback channel are configured in the frame structure, where the downlink sounding channel is used by the CAP to send a downlink sounding signal to the STA, and the CQI feedback channel is used for the STA.
- the downlink CQI measured according to the downlink sounding signal is fed back to the CAP; the CSI feedback channel is used by the STA to feed back the CSI of the downlink measured according to the downlink sounding signal to the CAP.
- the resource scheduling is performed according to the downlink CQI and the downlink CSI fed back by the STA.
- the quality of the channel corresponding to the STA may be calculated according to the resource allocation manner. For example, if the resource allocation mode is time division or frequency division, the STA feedback may be directly used.
- the downlink CQI and the CSI perform resource scheduling.
- the space division transmission interference corresponding to each STA is calculated according to the CSI fed back by each STA.
- the CQI fed back by each STA is used, the corresponding air separation needs to be removed. Thousands of disturbances.
- the CQI fed back by each STA may be processed according to other adjustment factors to obtain a CQI for performing resource scheduling.
- Mode 3 Considering that the data volume of CQI is small, the data volume of CSI is large, and the measurement accuracy of the downlink channel by STA is higher than that of the channel accuracy measured by CAP using the upper and lower reciprocity of TDD system.
- the CAP uses the upper and lower reciprocity of the TDD system to measure the downlink CSI to save the transmission bandwidth.
- the STA measures the downlink CQI, and reports the measurement result to the CAP through feedback, so that the CAP obtains the accurate CQI.
- a scheduling downlink When the requirements of the transmission resource are required, for example, when there is a demand for transmitting the downlink service, a requirement for transmitting the downlink signaling, or a request for the feedback of the uplink service, the resource scheduling of the downlink CQI and the downlink CSI is also required, and An uplink sounding channel, a downlink sounding channel, and a CQI feedback channel are configured in the frame structure, where the uplink sounding channel is used by the STA to send an uplink sounding signal to the CAP, and the downlink sounding channel is used by the CAP to send a downlink sounding signal to the STA.
- the CQI feedback channel is used by the STA to feed back the CQI of the downlink measured according to the downlink sounding signal to the CAP.
- the downlink transmission resource is scheduled, when the resource scheduling is performed according to one or more of the requirements of transmitting the downlink service, the requirement of transmitting the downlink signaling, and the requirement for the feedback of the uplink service, the uplink detection is measured on the uplink sounding channel.
- the signal is used to calculate the uplink CSI, and the downlink CSI is determined based on the uplink and downlink reciprocity of the system, and the resource scheduling is performed according to the downlink CSI and the downlink CQI fed back by the STA.
- the quality of the channel corresponding to the STA may be calculated according to the resource allocation manner. For example, if the resource allocation mode is time division or frequency division, the STA feedback may be directly used. The downlink CQI and the CSI perform resource scheduling. If the resource allocation mode is null, the space division transmission interference corresponding to each STA is calculated according to the CSI fed back by each STA. When the CQI fed back by each STA is used, the corresponding air separation needs to be removed. Thousands of disturbances. In addition, the CQI fed back by each STA may be processed according to other adjustment factors to obtain a CQI for performing resource scheduling.
- the STA may access the CAP scheduling resource, and configure a random access channel in the frame structure for the STA to access the CAP and associate with the CAP. relationship.
- the duration of the random access channel is determined according to the expected maximum number of STAs that initiate simultaneous access. If the current frame no longer allows other STAs to access the CAP, the random access channel may not be configured for the current frame.
- the downlink sounding channel may be located at two ends or in the middle of the downlink transport channel.
- MU-MIMO Multi-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 is involved.
- 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 transport channel, and can be transmitted in the uplink according to the maximum processing time required by the STA to be fed back.
- the downlink sounding channel is started at the previous maximum processing time position.
- Downstream sounding channel The specific location of the downlink transport channel is indicated by the periodic broadcast message of the system information channel. If the downlink sounding channel position is fixed, it can be used to indicate the presence or absence of the downlink sounding channel in the system information channel. If there are STAs with different processing capabilities in the system, the downlink sounding channel position is variable. By setting the downlink sounding channel position dynamically or semi-statically, it is possible to provide sufficient processing time for STAs of different processing capabilities.
- the STA may be configured to send an uplink sounding signal on the uplink sounding channel in two ways: CAP triggering, scheduling the STA to transmit the sounding signal; or after the CAP scheduling once, the STA is in the uplink sounding channel for a period of time
- the detection signal is periodically transmitted.
- the uplink scheduling request channel, the uplink random access channel, the downlink sounding channel, the uplink sounding channel, the CQI feedback channel, and the CSI feedback channel may be referred to as an auxiliary channel according to the role of the channel configured in the frame structure.
- the CQI feedback channel and/or the CSI feedback channel may be configured in an uplink transport channel, that is, the CQI feedback is The channel and/or CSI feedback channel is part of the uplink transport channel.
- the CQI feedback channel and/or the CSI feedback channel may also be configured as an auxiliary channel independently of the uplink transport channel.
- a control channel is further configured in the frame structure, and is configured to carry the uplink transmission channel, a downlink transmission channel, an uplink sounding channel, a downlink sounding channel, a CQI feedback channel, a CSI feedback channel, an uplink scheduling request channel, Descriptive information of one or more channels in the random access channel.
- the control channel is composed of scheduling signaling, and the description information is carried in the scheduling signaling.
- the scheduling signaling is used to indicate an object of resource scheduling, and a transmission resource scheduled for the object; the object is one or a group of stations STA.
- the duration of the control channel is determined according to the total transmission resources required by the CAP to send scheduling signaling to each STA associated with it.
- the length of each scheduling signaling may be summed to obtain the control channel period; or, if the length of each signaling is a fixed size, the fixed length of the signaling is multiplied by the number of downlink scheduling signaling, Get the control channel period.
- each channel in the configured frame structure can multiplex resources by one or a combination of time division, frequency division, code division, and space division.
- the figure shows a frame structure, including a downlink subframe and an uplink subframe, where the downlink subframe includes a preamble sequence, a system information channel, and a control channel.
- a downlink transmission channel and a downlink sounding channel where the uplink subframe includes an uplink sounding channel, an uplink scheduling request channel, an uplink transmission channel, and an uplink random access channel, and a guard interval GI is configured between the uplink subframe and the downlink subframe.
- the transmission resources are shared between the channels by time division multiplexing.
- Figure 2 shows only an example of a frame structure, which in the actual case dynamically configures the corresponding channel in the frame structure depending on the system application scenario or scheme.
- the resource multiplexing mode between the channels is determined by the type of the scheduled resource.
- the uplink transmission channel (which may include an uplink service transmission channel, an uplink signaling channel, a downlink service feedback channel, etc.)
- the uplink scheduling request channel and the uplink random access channel use frequency division and time division hybrid multiplexing.
- the system information channel and the control channel are frequency-multiplexed and time-division mixed.
- resources allocated for each STA in the same channel may also share transmission resources in a multiplexing manner using one or more combinations of time division, frequency division, code division, and space division.
- the downlink sounding channel shown in FIG. 3 and FIG. 4 is located in the middle of the downlink transport channel, and the downlink transport channel is divided into a downlink transport channel 1 and a downlink transport channel 2.
- 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.
- the frame structure indication mode is exemplified:
- 6 bits are used to indicate the duration of the control channel, and the maximum 63 OFDM symbols, the minimum allocation unit of resources: 1 OFDM symbol; indicated by 9 bits Downlink transmission channel period, maximum 512 OFDM symbols (including dedicated demodulation pilots;); 9 bits indicating uplink transmission channel week Period, maximum 512 OFDM symbols (including dedicated demodulation pilots;); 1 bit indicating protection interval DGI, 1 OFDM symbol;
- 2bits is used to indicate the uplink scheduling request channel configuration, respectively indicating 1, 2, 3, 4 OFDM symbols; 1bit is used to indicate the uplink random access channel configuration, respectively indicating presence/absence; if yes, only 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 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, and the maximum of 63 OFDM symbols is used; in the control channel, the downlink transmission channel period is indicated by 9 bits. Use 9bits to indicate the uplink transmission channel period, 1bit to indicate the downlink protection interval DGI, 2bits to indicate the uplink sounding channel configuration, 2bits to indicate the uplink scheduling request channel configuration, 1bits to indicate the uplink random access channel configuration, and 1bit to indicate the uplink protection interval UGI.
- the CAP can also calculate the frame length and carry indication information of the frame length on the system information channel or the control channel. Thereby, the STA directly obtains the frame length information.
- application examples one through five will explain how to perform resource scheduling according to requirements and configure the frame structure accordingly.
- This application example provides a system based on the upper and lower reciprocity, measures the quality of the downlink channel through the uplink sounding channel, and completes the downlink scheduling and transmission process. As shown in FIG. 5, the following steps are included:
- Step S501 The CAP receives and parses the downlink scheduling information, and obtains a requirement for transmitting the downlink service to the STA1 and the STA2.
- the requirement for transmitting the downlink service includes scheduling requirements of different service flows of each STA or each STA, for example, the service to be scheduled and Queue length, quality of service QoS requirements for different services, business priorities, and more.
- the requirement for transmitting the downlink service is carried by the downlink scheduling information.
- Step S502 The CAP is two STAs that need to be scheduled, that is, STA1 and STA2 schedule two uplink sounding channels;
- Step S503 The CAP measures the uplink sounding signals transmitted by the STA1 and the STA2 on the uplink sounding channel, and obtains the quality of the downlink transport channel corresponding to the STA1 and the STA2 according to the uplink and downlink reciprocity of the TDD system.
- Step S504 The CAP schedules downlink transmission resources for the STA1 and the STA2 according to the downlink scheduling information and the quality of the downlink transmission channel, respectively.
- STA1 and STA2 share downlink transmission resources through a combination of time division multiplexing.
- Step S505 The CAP schedules a transmission resource used for feeding back downlink service according to the downlink scheduling information and the quality of the downlink transmission channel.
- the downlink transmission of STA2 in the Nth frame does not feed back ACK2 signaling in the uplink transmission of the frame, which may be due to the following reasons: (1) STA2 downlink feedback in the Nth frame is in the N+k frame feedback; (2) The downlink service of STA2 does not need to feed back ACK signaling.
- the CAP configures a frame structure that matches the scheduled transmission resource.
- the STA learns the frame structure by parsing the system information channel, and learns the specific transmission resource allocation by analyzing the control channel.
- FIG. 6 the resource scheduling process for completing downlink traffic transmission through two frames, and the process of dynamically configuring the frame structure according to the scheduled resources.
- Application Example 2 This application example provides a quality information of a channel measured by the STA and fed back to the CAP.
- the CAP completes the uplink scheduling and transmission process according to the channel quality information of the feedback. As shown in FIG. 7, the method includes the following steps:
- Step S701 The CAP receives and parses the downlink scheduling information, and obtains a requirement for transmitting the downlink service to the STA1 and the STA2.
- the requirement for transmitting the downlink service includes scheduling requirements of different service flows of each STA or each STA, for example, the service to be scheduled and Queue length, quality of service QoS requirements for different services, business priorities, and more.
- the requirement for transmitting the downlink service is carried by the downlink scheduling information.
- Step S702 The CAP is two STAs that need to be scheduled, that is, STA1 and STA2 schedule two CQI feedback channels;
- Step S703 The CAP sends a sounding signal on a downlink sounding channel.
- Step S704 STA1 and STA2 respectively measure the sounding signals transmitted by the CAP on the downlink sounding channel, and obtain the quality of the downlink transport channel corresponding to STA1 and STA2.
- Step S705 STA1 and STA2 respectively pass the corresponding CQI feedback channel, and the measured downlink is performed. The quality of the transmission channel is fed back to the CAP;
- Step S706 The CAP schedules downlink transmission resources for STA1 and STA2 according to the downlink scheduling information and the quality of the downlink transmission channel, respectively.
- Step S707 The CAP schedules a transmission resource used for feeding back the downlink service according to the downlink scheduling information and the quality of the downlink transmission channel.
- the downlink transmission of STA2 in the Nth frame does not feed back ACK2 signaling in the uplink transmission of the frame, which may be due to the following reasons: (1) STA2 downlink feedback in the Nth frame is in the N+k frame feedback; (2) The downlink service of STA2 does not need to feed back ACK signaling.
- the CAP configures a frame structure that matches the scheduled transmission resource.
- the STA learns the frame structure by parsing the system information channel, and learns the specific transmission resource allocation by analyzing the control channel.
- FIG. 8 the resource scheduling process for completing downlink traffic transmission through two frames, and the process of dynamically configuring the frame structure according to the scheduled resources.
- the STA measures the downlink sounding channel and feeds back the quality of the channel to the CAP, so 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 channel configured in the frame structure can be adaptively varied with the transmission requirements, and preferably adaptively adjusted with the time selective fading of the wireless channel.
- This application example provides an uplink scheduling and transmission process, as shown in FIG. 9, which specifically includes the following steps:
- Step S901 The CAP receives the uplink scheduling request signal sent by the STA in the uplink scheduling request channel of the N-2 frame.
- Step S902 The CAP schedules an uplink sounding channel and an uplink transport channel for transmitting uplink service transmission requirements for the STA in the N-1th frame.
- Step S903 The CAP receives and parses uplink scheduling information on an uplink transmission channel of the N-1th frame, and obtains a requirement for the STA to transmit an uplink service.
- the demand for transmitting the uplink service includes the scheduling requirements of the STA or the STA for different service flows, for example, the service to be scheduled and the queue length, the quality of service QoS requirements of different services, the service priority, and the like.
- the requirement for transmitting the uplink service is carried by the uplink scheduling information.
- Step S904 The CAP measures the uplink sounding signal sent by the STA in the uplink sounding channel of the N-1 frame, and obtains the quality of the uplink transport channel corresponding to the STA.
- Step S905 The CAP transmits the uplink according to the STA. The demand of the service and the quality of the uplink transmission channel, and the uplink transmission resource is scheduled for the STA in the Nth frame.
- the CAP configures a frame structure that matches the scheduled transmission resource.
- the STA learns the frame structure by parsing the system information channel, and learns the specific transmission resource allocation by analyzing the control channel.
- FIG. 10 To further illustrate the resource scheduling process of the application instance of the present invention, refer to FIG. 10, a resource scheduling process for completing uplink service transmission through three frames, and a process of dynamically configuring a frame structure according to the scheduled resources.
- Step S1101 The CAP schedules an uplink transmission resource for the STA in the Nth frame.
- Step S1102 The STA transmits the uplink service demand in the uplink frame, and sends the uplink service to the CAP along with the uplink data.
- Step S1103 After receiving the requirement for the STA to transmit the uplink service, the CAP allocates an uplink transmission resource to the STA in the N+1th frame according to the requirement of the STA to transmit the uplink service.
- the CAP configures a frame structure that matches the scheduled transmission resource.
- the STA learns the frame structure by parsing the system information channel, and learns the specific transmission resource allocation by analyzing the control channel.
- FIG. 12 To further illustrate the resource scheduling process of the application instance of the present invention, refer to FIG. 12, a resource scheduling process for performing uplink service transmission through two frames, and a process of dynamically configuring a frame structure according to the scheduled resources.
- FIG. 13 is a schematic diagram of a system frame structure of an uplink and downlink scheduling transmission process provided by the 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 the N-1 frame.
- the STA0 service uplink queue waits for the number of scheduled packets.
- the CAP schedules STA0 to feed back the quality of the downlink channel through the uplink transport channel in the N-1th frame; to ensure efficient uplink scheduling of the Nth frame, the CAP schedules STA0 in the N-1th frame.
- the uplink sounding signal is transmitted on the uplink sounding channel 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 in 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.
- 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 to STA2 for 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 coding format is adopted.
- 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 64 OFDM symbol feedback uplink channels to STA1.
- the CAP calculates the control channel requirements: the downlink scheduling transmission, and the ACK/NACK signaling for the N0 frame STA0 uplink transmission, which requires two control subchannels; the uplink scheduling transmission requires six 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, 224 OFDM symbols are used for uplink transmission channel, and 1 OFDM symbol is used for uplink random access channel.
- 6 OFDM symbols are used for control channel transmission
- 384 OFDM symbols are used for downlink traffic transmission
- 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
- 224 OFDM symbols are used for uplink transmission channel
- 1 OFDM symbol is used for uplink random access channel.
- one OFDM symbol In addition to the system's inherent short preamble, long preamble, and system information channel, one 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 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 embodiment of the present invention further provides a resource scheduling device, as shown in FIG. 14, including: a scheduling module 1401, configured to perform resource scheduling according to a transmission requirement;
- the configuration module 1402 is configured to configure a frame length non-fixed frame structure that matches the scheduled resource.
- the configuration module 1402 configures at least a preamble sequence and a system information channel in the frame structure.
- the preamble sequence is used to implement synchronization; the system information channel is used to carry information indicating a frame structure.
- the configuration module 1402 schedules an uplink transmission resource according to the uplink transmission requirement, and configures an uplink transmission channel according to the frame structure; and schedules a downlink transmission resource according to the downlink transmission requirement, and accordingly A downlink transport channel is configured in the frame structure.
- the uplink transmission requirement includes one or more of a requirement for transmitting an uplink service, a requirement for transmitting uplink signaling, and a requirement for feedback for a downlink service.
- the configuration module 1402 includes one or more of an uplink transport channel, an uplink signaling channel, and a downlink service feedback channel.
- the downlink transmission requirement includes one or more of a requirement for transmitting a downlink service, a requirement for transmitting downlink signaling, and a requirement for feedback for an uplink service.
- the configuration module 1402 includes one or more of a downlink service transmission channel, a downlink signaling channel, and an uplink service feedback channel.
- the configuration module 1402 when there is an uplink transmission requirement, also configures an uplink sounding channel in the frame structure, where the station STA sends an uplink sounding signal to the central access point CAP; the scheduling module 1401, When the uplink transmission resource is scheduled according to the uplink transmission requirement, the uplink sounding signal is measured on the uplink sounding channel, and the uplink channel quality information CQI is obtained, and the uplink transmission resource is scheduled according to the measured uplink CQI.
- the configuration module 1402 is configured to configure, in the frame structure, a downlink sounding channel and a CQI feedback channel, where the downlink sounding channel is used by the CAP to send a downlink sounding signal to the STA, where the CQI is The feedback channel is used by the STA to feed back the downlink CQI measured according to the downlink sounding signal to the CAP.
- the scheduling module 1401 determines the downlink CQI according to the STA feedback based on the upper and lower reciprocity when scheduling the uplink transmission resource according to the uplink transmission requirement.
- the uplink CQI is used to schedule uplink transmission resources in combination with the measured uplink CQI.
- the configuration module 1402 when there is an uplink transmission requirement, also configures an uplink sounding channel for the STA to send an uplink sounding signal to the CAP; the scheduling module 1401 is scheduled according to the uplink transmission demand.
- the uplink sounding signal is measured on the uplink sounding channel, and the uplink CQI and the uplink channel state information CSI are obtained, and the uplink transmission resource is scheduled according to the measured uplink CQI and the uplink CSI.
- the configuration module 1402 is configured to configure, in the frame structure, a downlink sounding channel, a CQI feedback channel, and a CSI feedback channel, where the downlink sounding channel is used by the CAP to send a downlink sounding signal to the STA.
- the CQI feedback channel is used by the STA to feed back the downlink CQI measured according to the downlink sounding signal to the CAP;
- the CSI feedback channel is used by the STA to feed back the downlink CSI measured by the downlink sounding signal to the CAP;
- the scheduling module 1401 When scheduling the uplink transmission resource according to the uplink transmission requirement, based on the uplink and the reciprocity, determining the uplink CQI according to the downlink CQI fed back by the STA, and determining the uplink CSI according to the downlink CSI fed back by the STA, and combining the uplink CQI and the uplink
- the CSI schedules uplink transmission resources.
- the configuration module 1402 when there is an uplink transmission requirement, also configures an uplink sounding channel, a downlink sounding channel, and a CQI feedback channel in the frame structure, where the uplink sounding channel is used by the station STA to the central access point.
- the CAP sends an uplink sounding signal, where the downlink sounding channel is used by the CAP to send a downlink sounding signal to the STA, and the CQI feedback channel is used by the STA to feed back, to the CAP, the downlink CQI measured according to the downlink sounding signal; the scheduling module 1401, When the uplink transmission resource is scheduled according to the uplink transmission requirement, the uplink sounding signal is measured on the uplink sounding channel to obtain the uplink channel quality information CSI, and the uplink CQI is determined according to the downlink CQI fed back and forth by the STA, and combined.
- the uplink CQI and the uplink CSI schedule uplink transmission resources.
- the configuration module 1402 when there is an uplink transmission requirement, also configures an uplink sounding channel, a downlink sounding channel, and a CSI feedback channel in the frame structure, where the uplink sounding channel is used by the station STA to the central access point.
- the CAP sends an uplink sounding signal, where the downlink sounding channel is used by the CAP to send a downlink sounding signal to the STA, and the CSI feedback channel is used by the STA to feed back, to the CAP, the downlink CSI measured according to the downlink sounding signal; the scheduling module 1401, When the uplink transmission resource is scheduled according to the uplink transmission requirement, the uplink sounding signal is measured on the uplink sounding channel to obtain the uplink channel quality information CQI, and the uplink CSI is determined according to the downlink CSI fed back and forth by the STA, and combined The uplink CQI and the uplink CSI schedule uplink transmission resources.
- the configuration module 1402 is still in the frame when there is a downlink transmission requirement Configuring an uplink sounding channel for the STA to send an uplink sounding signal to the CAP; the scheduling module 1401, when scheduling the downlink transmission resource according to the downlink transmission requirement, measuring the uplink sounding signal on the uplink sounding channel, based on the upper and lower reciprocity The downlink CQI is obtained, and the downlink transmission resource is scheduled in combination with the measured downlink CQI.
- the configuration module 1402 when there is a downlink transmission requirement, also configures an uplink sounding channel in the frame structure, where the STA sends an uplink sounding signal to the CAP; the scheduling module 1401 is scheduled according to the downlink transmission demand.
- the downlink transmission resource is used, the uplink sounding signal is measured on the uplink sounding channel, and the downlink CQI and the downlink CSI are obtained based on the upper and lower reciprocity, and the downlink transmission resource is scheduled according to the measured downlink CQI and the downlink CSI.
- the configuration module 1402 is configured to configure, in the frame structure, a downlink sounding channel and a CQI feedback channel, where the downlink sounding channel is used by the CAP to send a downlink sounding signal to the STA, where the CQI is present.
- the feedback channel is used by the STA to feed back the downlink CQI measured by the downlink sounding signal to the CAP.
- the scheduling module 1401 performs resource scheduling according to the downlink CQI fed back by the STA when scheduling the downlink transmission resource according to the downlink transmission requirement.
- the configuration module 1402 is configured to configure, in the frame structure, a downlink sounding channel, a CQI feedback channel, and a CSI feedback channel, where the downlink sounding channel is used by the CAP to send a downlink sounding signal to the STA.
- the CQI feedback channel is used by the STA to feed back the downlink CQI measured according to the downlink sounding signal to the CAP;
- the CSI feedback channel is used by the STA to feed back the downlink CSI measured by the downlink sounding signal to the CAP; the scheduling module 1401
- the downlink transmission resource is scheduled according to the downlink transmission requirement, the downlink transmission resource is scheduled according to the downlink CQI and the downlink CSI fed back by the STA.
- the configuration module 1402 is configured to configure an uplink sounding channel, a downlink sounding channel, and a CQI feedback channel in the frame structure, where the uplink sounding channel is used by the STA to send an uplink sounding signal to the CAP.
- the downlink sounding channel is used by the CAP to send a downlink sounding signal to the STA
- the CQI feedback channel is used by the STA to feed back the downlink CQI measured according to the downlink sounding signal to the CAP
- the scheduling module 1401 is scheduled according to the downlink transmission demand.
- the uplink sounding signal is measured on the uplink sounding channel, and the downlink CSI is obtained based on the upper and lower reciprocity, and the downlink transmission resource is scheduled according to the downlink CSI and the downlink CQI fed back by the STA.
- the CQI includes one or more of a signal to noise ratio of a transmission channel, a signal to noise ratio, a modulation and coding set, a rank of a transmission channel matrix, and a precoding matrix set.
- the CSI includes at least one of a transport channel matrix H, a V matrix of the transport channel matrix H after SVD decomposition, and compressed information of the V matrix.
- the configuration module 1402 further configures an uplink scheduling request channel in the frame structure, where the STA sends an uplink scheduling request to request a transmission resource for reporting an uplink transmission requirement to the CAP.
- the scheduling module 1401 for the uplink scheduling request channel of the STA, schedules an exclusive uplink transmission resource, and is used by the STA to initiate uplink scheduling in a non-contention manner; or, for the uplink scheduling request channel of the STA, to allocate the shared uplink transmission resource, Used by the STA to initiate uplink scheduling in a competitive manner.
- the configuration module 1402 further configures a random access channel in the frame structure, and is used by the STA to access the CAP and establish an association relationship with the CAP.
- the configuration module 1402 further configures a control channel in the frame structure, and is configured to carry the uplink transport channel, the downlink transport channel, the uplink sounding channel, the downlink sounding channel, the CQI feedback channel, the CSI feedback channel, and the uplink. Decoding the request channel, description information of one or more channels in the random access channel.
- the control channel is composed of scheduling signaling, and the description information is carried in the scheduling signaling.
- the configuration module 1402 when the channel for uplink transmission and the channel for downlink transmission are configured in the frame structure, are also used for the channel for uplink transmission and the downlink for downlink transmission A guard interval is configured between channels.
- the scheduling module 1401 performs resource scheduling by using a resource allocation manner of one or more combinations of time division, frequency division, code division, and space division.
- the configuration module 1402, the configured system information channel and the control channel are time division multiplexing, frequency division multiplexing, code division multiplexing, frequency division and time division hybrid multiplexing, or code division and time division hybrid multiplexing.
- the configuration module 1402 configures an uplink transmission channel, an uplink scheduling request channel, and an uplink random access channel, using time division multiplexing, frequency division multiplexing, frequency division, and time division hybrid multiplexing, or code division and time division mixing. Reuse.
- the frame length does not exceed a preset length threshold.
- the resource scheduling method according to the present invention provides a solution capable of dynamically configuring a frame structure according to transmission requirements, and can dynamically adapt to uplink and downlink transmission requirements of data services with various types and characteristics in the future.
- the system can provide very small resource granularity, which can not only adapt to the large service rate requirements of different terminal devices, but also better adapt to the dynamic changes of the wireless channel. A detailed description will be given below.
- FIG. 15 is a schematic structural diagram of a system according to an embodiment of the present invention, where the system includes:
- a CAP 151 determines the structure of the current physical frame according to the scheduled transmission resource, and transmits information indicating the current physical frame structure in the current physical frame; and, at least one STA 152 communicating with the CAP 151, according to the current physical frame Information indicating the current physical frame structure, determining the structure of the current physical frame;
- FIG. 16 is a schematic structural diagram of a network device according to an embodiment of the present invention.
- the network device includes: a configuration unit 161 and a first communication unit 162.
- the configuration unit 161 determines the structure of the current physical frame according to the scheduled transmission resource.
- the first communication unit 162 transmits information indicating the current physical frame structure in the current physical frame, and communicates with at least one terminal device.
- each physical frame is determined by its structure and is not fixed.
- the configuration unit 161 configures a preamble sequence for synchronization for the current physical frame, and a system information channel for transmitting information indicating the current physical frame structure.
- the first communication unit 162 transmits the preamble sequence, and transmits information indicating the current physical frame structure on the system information channel.
- the configuration unit 161 configures a preamble sequence for synchronization and a system information channel for transmitting information indicating a current physical frame structure for the current physical frame, and optionally configures the current physical frame. At least one of the channels.
- the above multiple channels include the following situations:
- the foregoing multiple channels include: a first downlink transport channel for transmitting downlink traffic, and/or downlink signaling, and/or uplink traffic feedback; a downlink sounding channel for transmitting downlink sounding signals; and, second The downlink transport channel is used for transmitting downlink traffic, and/or downlink signaling, and/or uplink traffic feedback.
- the first communication unit 162 transmits a preamble sequence, and transmits a system information channel indicating information of the current physical frame structure on the system information channel; and transmits the correlation on the selectively configured channel.
- the determining unit 161 determines that the current physical frame further includes: configuring a control channel for the current physical frame, and transmitting information indicating a transmission resource allocation and scheduling, and a transmission format of a channel occupying the transmission resource.
- the first communication unit 162 sends a preamble sequence, and transmits information indicating a current physical frame structure on the system information channel; and transmits, on the control channel, a transmission format indicating a transmission resource allocation and scheduling, and a channel occupying the transmission resource.
- Information and, transmitted in a selectively configured channel.
- the first communication unit 162 sends a preamble sequence; transmitting, on the system information channel, a part of information indicating a current physical frame structure, where at least a duration of the control channel is included, and another part of the control channel is sent to indicate information about a current physical frame structure; And transmitting, on the control channel, information indicating a transmission resource allocation and scheduling, and a transmission format of a channel occupying the transmission resource; and transmitting the correlation on the selectively configured channel.
- the foregoing multiple channels include: an uplink sounding channel for transmitting an uplink sounding signal; an uplink scheduling request channel for transmitting an uplink scheduling request; and an uplink transport channel for transmitting an uplink service, and/or uplink signaling, and/or Or downlink service feedback, and/or downlink CQI feedback, and/or downlink CSI feedback; and, an uplink random access channel, for transmitting an uplink random access request.
- the foregoing multiple channels include: an uplink sounding channel for transmitting an uplink sounding signal; an uplink scheduling request channel for transmitting an uplink scheduling request; and an uplink transport channel for transmitting an uplink service, and/or uplink signaling, and/or Or downlink service feedback; CQI feedback channel for transmitting downlink CQI feedback; CSI feedback channel for transmitting downlink CSI feedback; and, uplink random access signal Channel, used to transmit uplink random access requests.
- the first communication unit 162 transmits a preamble sequence, transmits information indicating the current physical frame structure in the system information channel, and performs related reception on the selectively configured channel.
- the determining unit 161 determines that the current physical frame further includes: configuring a control channel for the current physical frame, and transmitting information indicating a transmission resource allocation and scheduling, and a transmission format of a channel occupying the transmission resource.
- the first communication unit 162 sends a preamble sequence, and sends the information indicating the current physical frame structure on the system information channel; transmitting, on the control channel, the allocation and scheduling of the transmission resource, and the transmission format of the channel occupying the transmission resource.
- Information and, received in a selectively configured channel.
- the first communication unit 162 transmits a preamble sequence; transmitting, on the system information channel, a part of information indicating a current physical frame structure, where at least the duration of the control channel is included, and another part of the control channel is sent to indicate the current physical frame structure; And transmitting information indicating a transmission resource allocation and scheduling, and a transmission format of a channel occupying the transmission resource; and receiving the correlation in the selectively configured channel.
- FIG. 17 is a schematic structural diagram of a terminal device according to an embodiment of the present invention.
- the terminal device includes: a parsing unit 171 and a second communication unit 172.
- the parsing unit 171 parses the information indicating the current physical frame structure in the current physical frame, and determines the structure of the current physical frame.
- the second communication unit 172 is in communication with the network device within the current physical frame.
- the length of each of the physical frames is determined by its structure and is not fixed.
- the current physical frame is composed of a preamble sequence, and a system information channel carrying information indicating a current physical frame structure.
- the second communication unit 172 receives the preamble sequence, and receives information indicating the current physical frame structure on the system information channel.
- the current physical frame includes a preamble sequence, a system information channel carrying information indicating a current physical frame structure, and at least one selectively configured channel.
- Channels that are selectively configured may include the following:
- the selectively configured channel includes: an uplink sounding channel for transmitting an uplink sounding signal; an uplink scheduling request channel for transmitting an uplink scheduling request; and an uplink transport channel for transmitting an uplink service, and/or an uplink signal. And/or downlink traffic feedback, and/or downlink CQI feedback, and/or downlink CSI feedback; and an uplink random access channel for transmitting an uplink random access request.
- the foregoing multiple channels include: an uplink sounding channel for transmitting an uplink sounding signal; an uplink scheduling request channel for transmitting an uplink scheduling request; and an uplink transport channel for transmitting an uplink service, and/or uplink signaling, and/or Or downlink service feedback; CQI feedback channel, used for transmitting downlink CQI feedback; CSI feedback channel, for transmitting downlink CSI feedback; and, uplink random access channel, for transmitting uplink random access request.
- the second communication unit 172 receives the preamble sequence; receives information indicating the current physical frame structure on the system information channel; and transmits the correlation on at least one selectively configured channel.
- the current physical frame further includes: a control channel, configured to transmit information indicating a transmission resource allocation and scheduling, and a transmission format of a channel occupying the transmission resource.
- the second communication unit 172 receives the preamble sequence; receives information indicating a current physical frame structure on the system information channel; and receives information indicating a transmission resource allocation and scheduling, and a transmission format of a channel occupying the transmission resource on the control channel; and Transmitting in association with at least one selectively configured channel.
- the second communication unit 172 receives the preamble sequence; and receives, on the system information channel, a part of the information indicating the current physical frame structure, where at least the duration of the control channel is included, and the other part of the control channel receives the information indicating the current physical frame structure; Receiving information indicating a transmission resource allocation and scheduling, and a transmission format of a channel occupying the transmission resource; and transmitting in association with the at least one selectively configured channel.
- the selectively configured channel includes: a first downlink transport channel for transmitting downlink traffic, and/or downlink signaling, and/or uplink traffic feedback; and a downlink sounding channel for transmitting a downlink sounding signal; And a second downlink transmission channel, configured to transmit downlink traffic, and/or downlink signaling, and/or uplink traffic feedback.
- the second communication unit 172 receives the preamble sequence; receives information indicating the current physical frame structure on the system information channel; and, performs reception on the at least one selectively configured channel.
- the current physical frame further includes: a control channel, configured to transmit information indicating a transmission resource allocation and scheduling, and a transmission format of a channel occupying the transmission resource.
- the second communication unit 172 receives the preamble sequence; receives information indicating a current physical frame structure on the system information channel; and receives information indicating a transmission resource allocation and scheduling, and a transmission format of a channel occupying the transmission resource on the control channel; and And receiving at least one selectively configured channel.
- the second communication unit 172 receives the preamble sequence; and receives, on the system information channel, a part of the information indicating the current physical frame structure, where at least the duration of the control channel is included, and the other part of the control channel receives the information indicating the current physical frame structure; Receiving information indicating a transmission resource allocation and scheduling, and a transmission format of a channel occupying the transmission resource; and receiving the correlation in at least one selectively configured channel.
- the network device configures the structure of the current physical frame according to the scheduled transmission resource, and sends information indicating the current physical frame structure in the current physical frame, and the terminal device uses the information indicating the current physical frame structure. , you can determine the structure of the current physical frame.
- the network device is a CAP and the terminal device is a STA.
- the CAP may send information indicating the current physical frame structure in the following two manners.
- Manner 1 Send information indicating the current physical frame structure on the system information channel.
- the information indicating the current physical frame structure includes one or more of the following: information indicating the existence of the channel, information indicating the existence and duration of the channel, and information indicating the duration of the channel.
- the STA associated with the CAP resolves the information indicating the current physical frame structure in the system information channel, and may determine the structure of the current physical frame, and add the durations of the respective channels in the current physical frame to obtain the frame length of the current physical frame.
- the CAP can also send the frame length information of the current physical frame on the system information channel.
- the STA associated with the CAP can directly determine the frame length of the current physical frame, and does not need to be calculated.
- Manner 2 Send information indicating the current physical frame structure on the system information channel and the control channel.
- the information indicating the current physical frame structure includes one or more of the following: information indicating the existence of the channel, information indicating the existence and duration of the channel, and information indicating the duration of the channel.
- the CAP sends a part of the information indicating the current physical frame structure on the system information channel, where the part indicates that the information of the current physical frame structure includes at least the duration of the control channel, and the control channel transmits another part of the information indicating the current physical frame structure.
- the STA associated with the CAP analyzes the information of the current physical frame structure, and determines the structure of the current physical frame, and adds the durations of the respective channels in the current physical frame to obtain the frame length of the current physical frame.
- the CAP can also send the frame length information of the current physical frame on the system information channel, and the STA associated with the CAP directly obtains the frame length of the current physical frame without calculation.
- the CAP may also send the frame length information of the current physical frame on the system information channel and the control channel. At this time, the STA associated with the CAP adds the frame lengths of the system information channel and the control channel to obtain the current physical frame. Frame length.
- FIG. 18 is a schematic structural diagram of a physical frame in the sixth application example of the present invention, wherein the abscissa indicates time, the ordinate indicates frequency or codeword, and the physical frame includes a preamble sequence and a system information channel.
- the CAP performs the following operations: transmitting a preamble sequence; and, transmitting information indicating a current physical frame structure on the system information channel.
- Control channel duration indication field indicating the duration of the control channel
- the control channel duration indication field may be 6 bits, the maximum may indicate 63 OFDM symbols, and the 1 OFDM symbol is the minimum resource allocation unit. For example: If the 6 bits are 010000, the conversion to decimal number is 16, which corresponds to 16 OFDM symbols.
- the downlink transmission channel duration indication field indicates the duration of the downlink transmission channel, and the downlink transmission channel duration indication field may be 9 bits, and the maximum indication may be 511 OFDM symbols. For example: If the 9 bits are 100000000, the conversion to decimal is 256, which corresponds to 256 OFDM symbols. 3
- the uplink transmission channel duration indication field indicates the duration of the uplink transmission channel, and the uplink transmission channel duration indication field may be 9 bits, and the maximum may indicate 511 OFDM symbols.
- Downstream sounding channel configuration field indicating the presence of the downlink sounding channel.
- the duration of the downlink sounding channel is fixed, and the downlink sounding channel configuration field may be 1 bit.
- the bit indicates that the downlink sounding channel exists, it is equivalent to indirectly indicating that the downlink sounding channel is a fixed time length.
- the uplink sounding channel configuration field indicates the existence and duration of the uplink sounding channel.
- the uplink sounding channel configuration field may be 2 bits, for example, filling 00 indicates no uplink sounding channel, filling 01 indicates that the uplink sounding channel occupies 1 OFDM symbol, and filling 10 indicates that the uplink sounding channel occupies 2 OFDM symbols, and filling in 11 indication The uplink sounding channel occupies 4 OFDM symbols.
- the uplink scheduling request channel configuration field indicates the presence and duration of the uplink scheduling request channel.
- the uplink scheduling request channel configuration field may be 2 bits, for example, 00 indicates that there is no uplink scheduling request channel, 01 indicates that the uplink scheduling request channel occupies 1 OFDM symbol, and 10 indicates that the uplink scheduling request channel occupies 2 OFDM symbols. Filling in 11 indicates that the uplink scheduling request channel occupies 4 OFDM symbols.
- the uplink random access channel configuration field indicates the presence of the uplink random access channel.
- the uplink random access channel has a fixed duration, and the uplink random access channel configuration field may be 1 bit.
- the uplink random access channel is indirectly indicated.
- the field 1-3 in the system information channel indicates the duration information of the channel
- the fields 4 and 7 indicate the information of the existence of the channel
- the fields 5 and 6 indicate the existence and duration of the channel. information.
- the downlink sounding channel and the uplink random access channel may not be fixed durations.
- the downlink sounding channel configuration field and the uplink random access channel configuration field may also use multi-bit indicating channel existence and Duration, or information indicating the duration of the channel.
- the physical frame structure in the sixth application example does not include the control channel, the downlink transmission channel, the downlink sounding channel, the uplink transmission channel, the uplink sounding channel, the uplink random access channel, and the uplink scheduling request channel, and the CAP is in the control channel duration indication field.
- the downlink transmission channel duration indication field and the uplink transmission channel duration indication field, the filling duration is 0, and the value of the indication channel does not exist in the downlink sounding channel configuration field and the uplink random access channel configuration field, and the uplink sounding channel configuration field and the uplink
- the scheduling request configuration field fills in the value indicating that the channel does not exist.
- the duration of the preamble sequence and the system information channel is preset, and both the CAP and the STA are aware of the preset condition, so the STA parses the information indicating the current physical frame structure from the system information channel, and can determine the current physics. Only the preamble sequence and the system information channel are included in the frame, thereby determining that the transmitting operation is not performed in the current physical frame, and only the relevant receiving operation is performed.
- Application example seven 19 is a schematic structural diagram of a physical frame in the seventh application example of the present invention, wherein the abscissa represents time, the ordinate represents frequency or codeword, and the physical frame includes a preamble sequence, a system information channel, a downlink guard interval, an uplink scheduling request channel, and an uplink. Random access channel.
- the CAP performs the following operations: transmitting a preamble sequence; and, transmitting information indicating a current physical frame structure on the system information channel.
- the downlink protection interval duration in the seventh application example the CAP may be carried in the information indicating the current physical frame structure, where the system information channel is based on the fields listed in the application instance 6. It is also possible to have an indication field of the guard interval, which may indicate the duration of the downlink guard interval by multiple bits, or in the case where the guard interval has a fixed duration, the field may also indicate the existence of the downlink guard interval with only 1 bit.
- the CAP may also be carried in a broadcast information frame (BCF) periodically broadcasted by the downlink transmission channel, and the BCF indicates the downlink protection interval by using 2 bits. For example, when the value is 0, the downlink protection interval is 2 OFDM symbols. When the value is 1, the downlink protection interval is 4 OFDM symbols.
- BCF broadcast information frame
- the STA periodically detects the duration of the downlink protection interval by periodically detecting the BCF. At this time, the CAP does not need to indicate the downlink protection interval in each physical frame. Duration, saving the overhead of the system information channel.
- the STA determines the structure of the current physical frame, thereby determining that the following physical operations can be selectively performed in addition to performing the related receiving operations on the current physical frame:
- the uplink scheduling request channel sends an uplink scheduling sequence, thereby triggering the CAP to allocate resources for sending the uplink scheduling request; or sending fast signaling feedback on the uplink scheduling request channel.
- the STA obtains the transmission resources of the uplink random access channel and the uplink scheduling request channel in a competitive manner. Therefore, the CAP does not need to send resource indications for the two channels on the control channel, and the control channel may not be configured.
- the physical frame structure in the seventh application example may also include only one of an uplink random access request channel and an uplink scheduling request channel.
- the application scenario of this application example 8 includes: CAP has downlink service transmission requirements for STAs; channel detection is required before downlink traffic transmission; STA has no uplink traffic, uplink signaling, or lower industry feedback requirements.
- the CAP needs to perform downlink traffic transmission through two physical frames, as shown in Figures 20a and 20b, where the abscissa represents time and the ordinate represents frequency or codeword.
- the CAP performs the following send operations: sending a preamble sequence; and, in the system
- the information channel transmits information indicating a current physical frame structure; and, in the control channel, transmits information indicating a transmission resource allocation and scheduling, and a transmission format of a channel occupying the transmission resource; and transmitting a downlink sounding signal on the downlink sounding channel.
- the STA determines the structure of the first physical frame by indicating the current physical frame structure, and determines that the first physical frame can perform the following transmission operation by the ilt: the downlink channel measurement result is fed back to the CAP on the uplink transmission channel.
- the downlink channel measurement result is obtained by the STA based on the downlink sounding signal sent by the CAP, and includes the downlink CQI, or includes the downlink CQI and the downlink CSI.
- the CAP performs the following sending operation: sending a preamble sequence; and transmitting information indicating a current physical frame structure on the system information channel; and transmitting and indicating scheduling and transmission resource allocation on the control channel Information of the transmission format of the channel; and, transmitting downlink service data on the downlink transmission channel.
- the STA determines the structure of the second physical frame by indicating the information of the current physical frame structure, and thereby determines that the transmitting operation is not performed in the second physical frame.
- the CAP needs to complete downlink traffic transmission through two physical frames, as shown in FIG. 21 and FIG. 20b, where the abscissa represents time and the ordinate represents frequency or codeword.
- the CAP performs the following sending operation: transmitting a preamble sequence; and transmitting information indicating a current physical frame structure on the system information channel; and transmitting and indicating scheduling and transmission resource allocation on the control channel Information on the transmission format of the channel.
- the STA determines the structure of the first physical frame, and it is determined by it ⁇ that the following transmission operation can be performed in the first physical frame:
- the STA sends an uplink sounding signal to the CAP on the uplink sounding channel, so that the CAP uses the uplink sounding signal to perform uplink channel quality measurement, or performs uplink channel quality and uplink channel state measurement, and obtains a downlink channel according to the principle of uplink and downlink reciprocity. CQI, or get the CQI and CSI of the downlink channel.
- the CAP performs the following sending operation: sending a preamble sequence; and transmitting information indicating a current physical frame structure on the system information channel; and transmitting and indicating scheduling and transmission resource allocation on the control channel Information of the transmission format of the channel; downlink traffic data is transmitted on the downlink transmission channel.
- the STA determines the structure of the second physical frame by indicating the information of the current physical frame structure, and thereby determines that the transmitting operation is not performed in the second physical frame.
- the CAP may indicate the downlink guard interval by using two the same optional implementation manners as the application instance 7.
- the system information channel is based on the fields listed in the application instance 6.
- the indicator field of the guard interval may also be used, and the field may indicate the duration of the downlink guard interval by using multiple bits. Alternatively, if the guard interval has a fixed duration, the field may also indicate the existence of the downlink guard interval by only 1 bit.
- the system information channel has the same fields as in the embodiment.
- the control channel duration indication field of the system information channel is filled in correspondingly.
- the value is 9 bits in the control channel to indicate the duration of the downlink transmission channel.
- the CAP can complete downlink traffic transmission by using one physical frame as shown in Fig. 20b.
- the first physical frame and the second physical frame may be continuous or non-contiguous.
- channel detection may be performed on the downlink detection channel and the uplink sounding channel simultaneously, that is, the downlink sounding channel, the uplink sounding channel, and the uplink transmission channel are simultaneously configured in the first physical frame.
- the CAP uses the uplink sounding signal sent by the STA to perform the uplink channel state measurement, and obtains the downlink CSI based on the uplink and downlink reciprocity, and receives the downlink CQI that the STA feeds back in the uplink transmission channel; or, the CAP uses the uplink sounding signal sent by the STA.
- the uplink channel quality measurement is performed, and the downlink CQI is obtained based on the uplink and downlink reciprocity, and the downlink CSI fed back by the STA in the uplink transmission channel is received.
- the channel detection is performed in one physical frame as an example. In actual applications, channel detection may also be performed through multiple physical frames, which is not mentioned here.
- the application scenario of this application example 9 includes: STA has uplink service transmission requirement; channel detection is required before uplink service transmission; CAP has no downlink service, downlink signaling or uplink service feedback requirement.
- the STA needs to complete the uplink transmission by using two physical frames, as shown in FIG. 21 and FIG. 22, where the abscissa indicates time.
- the ordinate represents the frequency or codeword.
- the CAP performs the following sending operation: transmitting a preamble sequence; and transmitting information indicating a current physical frame structure on the system information channel; and transmitting and indicating scheduling and transmission resource allocation on the control channel Information on the transmission format of the channel.
- the STA determines the structure of the current physical frame, and thereby determines that the following transmission operation can be performed in the first physical frame:
- the uplink sounding channel sends an uplink sounding signal to the CAP, so that the CAP uses the uplink sounding signal to perform uplink channel quality measurement, obtain an uplink CQI, or perform uplink channel quality measurement and uplink channel state measurement, and obtain uplink CQI and CSI.
- the CAP performs the following sending operation: sending a preamble sequence; and transmitting information indicating a current physical frame structure on the system information channel; and transmitting and indicating scheduling and transmission resource allocation on the control channel Information on the transmission format of the channel.
- the STA determines the structure of the current physical frame, and thereby determines that the second physical frame can be executed as Send operation:
- the uplink service data is transmitted on the uplink transmission channel.
- the STA needs to complete the uplink transmission by using two physical frames, as shown in FIG. 20a and FIG. 22, where the abscissa indicates time, vertical.
- the coordinates represent the frequency or codeword.
- the CAP performs the following sending operation: transmitting a preamble sequence; and transmitting information indicating a current physical frame structure on the system information channel; and transmitting and indicating scheduling and transmission resource allocation on the control channel Information of the transmission format of the channel; and, transmitting a downlink sounding signal on the downlink sounding channel.
- the STA determines the structure of the current physical frame, and thereby determines that the following transmission operation can be performed in the first physical frame:
- the downlink CQI is sent to the CAP on the uplink transmission channel, or the downlink CQI and CSI are transmitted. Therefore, the CAP obtains the uplink CQI or the uplink CQI and CSI based on the principle of uplink and downlink reciprocity.
- the CAP performs the following sending operation: sending a preamble sequence; and transmitting information indicating a current physical frame structure on the system information channel; and transmitting and indicating scheduling and transmission resource allocation on the control channel Information on the transmission format of the channel.
- the STA determines the structure of the current physical frame and thereby determines that the following transmission operation can be performed in the second physical frame:
- the uplink service data is transmitted on the uplink transmission channel.
- the CAP may indicate the downlink guard interval by using two the same optional implementation manners as the application instance 7.
- the system information channel is based on the fields listed in the application instance 6.
- the indicator field of the guard interval may also be used, and the field may indicate the duration of the downlink guard interval by using multiple bits. Alternatively, if the guard interval has a fixed duration, the field may also indicate the existence of the downlink guard interval by only 1 bit.
- the system information channel has the same fields as in the embodiment.
- the control channel duration indication field of the system information channel is filled in correspondingly. Value, 9 bits are used in the control channel to indicate the duration of the uplink transport channel.
- the CAP may not configure the uplink sounding channel, and complete the uplink traffic transmission through one physical frame shown in FIG.
- the CAP may also configure the downlink sounding channel, the uplink sounding channel, and the uplink transport channel in the first physical frame, and the CAP uses the STA in the first physical frame.
- the uplink sounding signal sent by the uplink sounding channel performs uplink channel state measurement and obtains uplink
- the CSI receives the downlink CQI fed back by the STA in the uplink transmission channel of the first physical frame, and obtains the uplink CQI based on the uplink and downlink reciprocity, or the CAP uses the uplink sent by the STA on the uplink sounding channel of the first physical frame.
- the detection signal performs the uplink channel quality measurement, obtains the uplink CQI, receives the downlink CSI fed back by the STA in the uplink transmission channel of the first physical frame, and obtains the uplink CSI based on the uplink and downlink reciprocity.
- the channel detection is performed in one physical frame as an example.
- channel detection may also be performed through multiple physical frames, which is not mentioned here.
- several possible physical frame structures are exemplified, and the purpose is to explain the association between the transmission channel and the corresponding sounding channel in the physical frame of the embodiment of the present invention.
- the actual application scenario may be more complicated.
- the CAP and each STA have different transmission requirements. Based on whether the STA supports channel detection, some channel detection is required before uplink and downlink transmission. Channel detection may not be required before the uplink and downlink transmission.
- the following application examples show the physical frame structure that may be configured in other application scenarios.
- FIG. 23 is a schematic structural diagram of a physical frame in the tenth application example of the present invention.
- the physical frame includes a downlink subframe and an uplink subframe, where the downlink subframe includes a preamble sequence, a system information channel, a control channel, and a downlink transmission channel, and the uplink subframe includes an uplink transmission channel.
- Each STA can share uplink transmission resources by time division, frequency division, code division, space division or a combination of the above multiplexing methods.
- the CAP may send information indicating the current physical frame structure on the system information channel, as follows:
- the duration of the control channel is indicated by 6 bits, which can indicate up to 63 OFDM symbols. For example: If the 6 bits are 010000, the conversion to decimal number is 16, corresponding to 16 OFDM symbols.
- the length of the downlink transmission channel is indicated by 9 bits, and the maximum 511 OFDM symbols. For example: If the 9 bits are 100000000, the conversion to decimal is 256, corresponding to 256 OFDM symbols. In the system information channel, 9 bits are used to indicate the length of the uplink transmission channel, which is a maximum of 511 OFDM symbols.
- the guard interval can be indicated by 1 bit, for a total of 1 OFDM symbol. Or the system information channel does not indicate the guard interval, but the system is configured.
- the CAP may also send a message indicating a current physical frame structure on the system information channel and the control channel. Information, for example:
- control channel duration is transmitted by 6 bits; in the control channel, the bit transmits the downlink transmission channel duration, and 9 bits are used to transmit the uplink transmission channel duration.
- signaling can be separated from traffic in uplink and downlink transmissions.
- Figure 24 is a block diagram showing the structure of a physical frame in the application example 11 of the present invention.
- a downlink sounding channel is set in the downlink subframe.
- the presence information of the downlink sounding channel is included in the information sent by the CAP indicating the current physical frame structure, and can be implemented by 1 bit and transmitted in the system information channel.
- the downlink sounding channel can be located behind the downlink transport channel.
- Figure 25 is a schematic diagram showing the structure of a physical frame in the application example 12 of the present invention, wherein the downlink sounding channel is located in the middle of the downlink transmission channel.
- downlink MU-MIMO system performance is not only sensitive to downlink channel state information delay, but multi-user MIMO involves large signal processing complexity.
- the downlink sounding channel is located in the middle of the downlink transmission channel. If the downlink sounding channel position is fixed, the presence of the downlink sounding channel can be indicated by 1 bit in the system information channel. If there are STAs with different processing capabilities in the system, the downlink sounding channel position is variable. At this time, not only the presence of the downlink sounding channel needs to be indicated in the system information channel, but also the duration of the two downlink transport channels in FIG. 25 needs to be indicated.
- the duration indications of the two downlink transmission channels can be used in the following three ways:
- the total duration of the downlink transmission channel and the duration of the downlink transmission channel 2 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 CAP sends information indicating the current physical frame structure on the system information channel, for example: 6 bits are used to indicate the duration of the control channel; 9 bits are used to indicate the total duration of the downlink transmission channel, and 7 bits are used to indicate the downlink transmission channel.
- the duration of the uplink transmission channel is indicated by 9 bits;
- the downlink sounding channel is indicated by 2 bits, indicating: no downlink sounding channel, downlink sounding channel position 1, downlink sounding channel position 2, and downlink sounding channel position 3, for matching different Sounding bandwidth.
- the downlink sounding channel positions 1, 2, and 3 are all system-defined locations.
- the CAP may send information indicating a current physical frame structure on the system information channel and the control channel, for example, in the system information channel, the CAP uses 6 bits to indicate the duration of the control channel, and in the control channel, The bit indicates the total duration of the downlink transmission channel, 7 bits indicate the duration of the downlink transmission channel 2, 9 bits indicate the duration of the uplink transmission channel, and 2 bits indicate the position of the downlink sounding channel.
- Figure 26 is a diagram showing the structure of a physical frame in the thirteenth application example of the present invention.
- auxiliary channels are set in the uplink subframe, for example: one or more of an uplink sounding channel, an uplink scheduling request channel, and an uplink random access channel are set in the uplink subframe.
- Figure 26 is only an example of the frame structure included in all three auxiliary channels. In actual situations, some auxiliary channels may not be considered depending on the system application scenario or scheme.
- the CAP may send information indicating a current physical frame structure on the system information channel, for example, 6 bits are used to indicate a control channel duration in the system information channel; 9 bits are used to indicate a downlink transmission channel duration; The bit indicates the duration of the uplink transmission channel; the presence of the uplink sounding channel is indicated by 2 bits and is long, indicating 0, 1, 2, 4 OFDM symbols respectively; 2 bits are used to indicate the existence and time length of the uplink scheduling request channel, respectively indicating 1 2, 3, 4 OFDM symbols; 1 bit indicates the presence of the uplink random access channel, indicating whether there are two cases, if any, fixed to 1 OFDM symbol.
- the CAP may send information indicating a current physical frame structure on the system information channel and the control channel, for example:
- the system information channel 6 bits are used to indicate the duration of the control channel, and 1 bit is used to indicate the existence of the uplink random access channel; in the control channel, 9 bits are used to indicate the duration of the downlink transmission channel, and 9 bits are used to indicate the uplink transmission channel.
- the duration of the uplink sounding channel is indicated by 2 bits and is long and long, and the presence of the uplink scheduling request channel is indicated by 2 to be long.
- Figure 27 is a diagram showing the structure of a physical frame in the application example 14 of the present invention.
- a downlink sounding channel is set in the downlink subframe, and an uplink sounding channel, an uplink scheduling request channel, and an uplink random access channel are also set in the uplink subframe.
- some auxiliary channels may not be considered depending on the system application scenario or scheme.
- the uplink protection interval is reserved in advance by the transmission, that is, the uplink transmission time is advanced, and the protection interval of the uplink to the downlink transition is reserved for the CAP and the STA.
- the CAP can pass the STA in the network access phase.
- the resource sent in the control channel indicates the notification timing advance, and the STA performs the transmission advance according to the timing advance in the subsequent uplink transmission operation.
- the uplink guard interval in advance by transmitting, indicating the downlink guard interval of the downlink to uplink transition It shall be not less than the sum of the maximum downlink-to-uplink transmission and uplink-to-downlink transmission and reception times of the CAP and STA or STA and the CAP.
- Figure 29 is a diagram showing the structure of a physical frame in the fifteenth application example of the present invention, wherein the abscissa represents time and the ordinate represents frequency or codeword.
- the CAP performs the following sending operation: transmitting a preamble sequence; and transmitting information indicating a current physical frame structure on the system information channel; and transmitting, on the control channel, indicating allocation and scheduling of the transmission resource, and a channel occupying the transmission resource Information of the transmission format; and, transmitting one or more of downlink service data, downlink signaling, and uplink service feedback on the downlink transmission channel; and transmitting a downlink sounding signal on the downlink sounding channel; and, in the downlink transmission channel One or several of downlink service data, downlink signaling, and uplink service feedback are sent.
- the STA determines the structure of the current physical frame, and determines that the following sending operation can be performed in the current physical frame: sending an uplink sounding signal on the uplink sounding channel; and initiating an uplink scheduling request in the uplink scheduling request channel;
- Uplink traffic, and/or uplink signaling, and/or uplink feedback are transmitted on the uplink transmission channel; random access is initiated on the uplink random access channel.
- the uplink guard interval and the downlink guard interval may be indicated in a similar manner to the application instance 7.
- the uplink transmission channel, the uplink scheduling request channel, and the uplink random access channel pass time division multiplexing and frequency division.
- the resource is multiplexed in one way or in a combination of code division multiple access, and the physical frame structure in the application example fifteen is taken as an example.
- FIG. 30 is an example of such a multiplexing situation.
- the multiplexing mode can be preset and is known by both the CAP and the STA. In this case, the multiplexing mode is not required to be indicated in the physical frame, or can be indicated by the control channel, for example, 4 bits are used to indicate the uplink scheduling request channel on the uplink transmission channel.
- the edge of the channel is edged.
- control channel and the system information channel may be multiplexed by one of a time division multiplexing, a frequency division multiplexing, and a code division multiple access, to apply the resource.
- the physical frame structure in the fifteenth embodiment is taken as an example.
- Fig. 31 is an example of such a multiplexing case.
- the system information channel and the control channel are frequency-multiplexed and time-division mixed-multiplexed. This multiplexing mode is preset and known to both the CAP and the STA, so there is no need to indicate the multiplexing mode in the physical frame.
- the control channel and the system information channel can also multiplex resources only in a frequency division manner.
- resources allocated for each STA in the same channel may also share transmission resources in a multiplexing manner using one or more combinations of time division, frequency division, code division, and space division.
- the information indicating the current physical frame structure includes: information indicating the presence of the first channel.
- Information indicating the presence of the first channel is carried in at least one channel of the physical frame.
- the first channel is a downlink sounding channel.
- the information indicating the current physical frame structure further includes: information indicating the duration of the second channel.
- the duration information indicating the second channel is carried in at least one channel of the physical frame.
- the second channel can be a downlink transport channel or an uplink transport channel.
- the downlink channel detection may be performed first, and then the uplink channel measurement result is obtained based on the uplink and downlink reciprocity.
- the downlink channel detection may be performed first. The downlink channel measurement result is obtained.
- the first channel is an uplink random access channel.
- the information indicating the current physical frame structure includes: the existence of the first channel and the information of the duration.
- the information of the presence and duration of the first channel is carried in at least one channel of the physical frame.
- the first channel is an uplink scheduling request channel. In another optional implementation manner, the first channel is an uplink sounding channel.
- the information indicating the current physical frame structure further includes: duration information indicating the second channel.
- the duration information indicating the second channel is carried in at least one channel of the physical frame.
- the second channel is an uplink transport channel or a downlink transport channel.
- the uplink channel detection may be performed first, and then the downlink channel measurement result is obtained based on the uplink and downlink reciprocity.
- the uplink channel detection may be performed first. Get the uplink channel measurement result.
- the information indicating the current physical frame structure includes: duration information indicating the first channel, the duration being greater than or equal to zero.
- the duration information indicating the first channel is carried in at least one channel of the physical frame.
- the first channel is a control channel for indicating a transmission resource allocation and scheduling, and a transmission format of a channel occupying the transmission resource.
- the first channel is a downlink transmission channel.
- the information indicating the current physical frame structure further includes: information indicating the presence and duration of the second channel.
- Information indicating the presence and duration of the second channel is carried in at least one channel of the physical frame.
- the second channel is an uplink sounding channel for transmitting an uplink sounding signal.
- the uplink channel measurement may be performed first, and the downlink channel measurement result is obtained based on the uplink and downlink reciprocity.
- the first channel is a downlink transmission channel.
- the information indicating the current physical frame structure further includes: information indicating the existence of the second channel.
- Information indicating the presence of the second channel is carried in at least one channel of the physical frame.
- the second channel is a downlink sounding channel for transmitting a downlink sounding signal.
- the downlink channel measurement may be performed first to obtain a downlink channel measurement result.
- the first channel is an uplink transport channel.
- the information indicating the current physical frame structure further includes: information indicating the presence and duration of the second channel.
- Information indicating the presence and duration of the second channel is carried in at least one channel of the physical frame.
- the second channel is an uplink sounding channel for transmitting an uplink sounding signal.
- the uplink channel measurement may be performed first to obtain an uplink channel measurement result.
- the first channel is an uplink transmission channel.
- the information indicating the current physical frame structure further includes: information indicating the existence of the second channel.
- Information indicating the presence of the second channel is carried in at least one channel of the physical frame.
- the second channel is a downlink sounding channel for transmitting a downlink sounding signal.
- the downlink channel measurement may be performed first, and the uplink channel measurement result is obtained based on the uplink and downlink reciprocity.
- the embodiment of the invention further provides an indication method for specifically indicating the allocation of each channel resource in the frame structure, as follows:
- System Information Channel Field Definition The system information channel is transmitted using MCS0, and space time coding is not used.
- the system information field definition is shown in Table 1.
- the uplink sounding channel is 1 OFDM port.
- the uplink sounding channel is 2 OFDM ports.
- the uplink sounding channel is 4 OFDM ports.
- the scheduling request channel is 1 OFDM port.
- the scheduling request channel is 2 OFDM ports
- the scheduling request channel is 4 OFDM ports.
- the initial state of the register is 0xFF, and the register state is inverted as the CRC check sequence output after the end of the operation.
- the high-order register output corresponds to the upper bit ( .3 ), and the low-order register output corresponds to the lower bit ( ) o
- Control channel field definition The control channel is transmitted by MCS1, and space-time coding is not used.
- the control channel consists of multiple unicast and broadcast scheduling signaling.
- the uplink and downlink unicast scheduling signaling fields are shown in Table 2.
- this transmission is 4 3 ⁇ 4u
- this transmission is 5 stream feedback, indicating the number of columns of the feedback matrix MU-MIMO
- this transmission is 8 3 ⁇ 4u MU-MIMO
- MU-MIMO space; 3 ⁇ 4 up: 1 ⁇ 2 bit
- 3 ⁇ 4 8 0 , b 54 — b 49 indicates the resources used for signaling and feedback transmission in the user resource group, the domain value is 0 ⁇ 63.
- b. 6 is the CRC of the unicast scheduling signaling field and the XOR of the unique 12-bit ID of the local cell allocated by the CAP.
- Uplink and downlink transport channel resource allocation types are:
- this part supports time division resource multiplexing scheduling.
- the time-frequency resources allocated to each STA on the uplink or downlink transport channel are referred to as resource groups.
- the OFDM symbol index in the STA resource group is from 0 to D ( 2 — 4 ) - 1 according to the time increment direction.
- D b 32 b 3 'b 24 represents a decimal number corresponding to bit 2 b ... ⁇ .
- Time division multiplexing resource allocation In STA scheduling signaling (Table 2), use [ 3 ⁇ 416 3 ⁇ 415 to indicate STA resource group start OFDM symbol index, field value 0 ⁇ 510; use [ ⁇ 32 ⁇ '" 4] to indicate STA resource group The number of consecutive OFDM symbols occupied.
- the resource group allocated for the STA includes the resources occupied by the demodulation pilot.
- Transmission Channel Demodulation Pilot This section dynamically adjusts the demodulation pilot pattern. Different time domain pilot intervals can be configured by control channel scheduling signaling 5 (Table 2); different frequency domain pilot patterns can be configured by control channel scheduling signaling 7 (Table 2).
- the demodulation pilot needs to be precoded (dedicated demodulation pilot); if 0 is 00 or 11, the demodulation pilot does not need precoding processing (common demodulation pilot).
- the demodulation pilot pattern is as follows:
- the demodulation pilot pattern is shown in Table 3.
- the number of pilot symbols, DP refers to the number of consecutive OFDM symbols occupied by the demodulation pilot in the time domain.
- Table 4 defines the subcarrier positions corresponding to the pilot symbols in the demodulation pilot pattern.
- the demodulation pilot spacing is designed as follows:
- Different time domain pilot intervals can be configured by the control channel scheduling signaling b 45 ( 0 ) to adapt to different wireless propagation environments.
- Time domain pilot spacing configuration, DPI T ie: Inserting a set of demodulation pilots every D ⁇ OFDM symbols.
- the pilot sequence generator polynomial is 1 + + 15 .
- the initial state of the register is:
- the time domain baseband signal of the ti antenna port is
- H (t) is the time domain window function, if is the loading symbol of the A subcarrier on the first spatial stream, [3 ⁇ 4] 3 ⁇ 4 . represents the element of the first row and column of the precoding matrix 3 ⁇ 4£ ⁇ «.
- the downlink multi-antenna transmission modes supported in this section are as follows:
- Mode 1 Open-loop SU-MIMO
- the STA can receive two codewords in parallel.
- the precoding matrix eC ' s in open loop mode is a column orthogonal matrix, and ⁇
- ⁇ .
- Mode 2 For closed-loop SU-MIMO closed-loop SU-MIMO, the STA can receive two codewords in parallel and precode in units of subcarrier groups.
- the precoding matrix grouping is defined as follows: The number of groups of precoding packets of the useful subcarrier is Ng , and the set of subcarrier numbers within the gth packet is 0, and the group uses the same precoding matrix.
- the number of subcarriers g I in the same precoding packet in the SU-MIMO mode is determined by the following formula.
- ⁇ ⁇ -DPI F
- ⁇ ⁇ is defined in the Appendix.
- ⁇ ⁇ has values of 1 and 2.
- £)3 ⁇ 4 1, 4 subcarriers are grouped: [ -115,-113 ][ -112,-109 ][ -108,-105 ][ -104,-101 ][ -100,-97 ][ -96,-93 ][ -92,-89 ][ -88,-85 ][-84,-81 ][ -80,-77 ][ -76,-73 ][ -72,-69 ][ -68,-65 ][ -64,-61 ][ - 60,-57 ][ -56,-53 ][ -52,-49 ][ -48,-45 ][ -44,-41 ][ -40,-37 ][ -36,-33 ][ -32 , -29 ]
- the STA can feed back channel information according to the MAC layer indication.
- each STA can only receive one codeword and pre-code it in units of subcarrier groups.
- the precoding matrix grouping is defined as follows: The number of groups of precoding packets of the useful subcarrier is ⁇ , and the set of subcarrier numbers within the gth packet is ⁇ ⁇ , and the group uses the same precoding matrix.
- the number of subcarriers Qg in the same precoding packet in the MU-MIMO mode is determined by the following formula.
- ⁇ n ⁇ DPi F
- D ⁇ is defined in Appendix B.
- the value of DPI ⁇ is 1.
- the STA may feed back channel information according to the MAC layer indication.
- Uplink transmission channel multi-antenna scheme The uplink multi-antenna transmission modes supported in this part are:
- Mode 1 Open Loop SU-MIMO
- Mode 2 Closed-loop SU-MIMO
- the signaling/feedback transmission channel described herein refers to a channel for transmitting signaling and/or feedback information.
- the 0 ⁇ 454 3 ⁇ 453 '" 3 ⁇ 449 indicates that the service transmission starts to transmit the packet data and its demodulation pilot from the OFDM symbol indexed to 1 in the STA resource group.
- ⁇ ( 4 3 ''' 9) is 4 3 ' 9 corresponds to the decimal number, which is high and 9 is low.
- OFDM symbol 0 to OFDM symbol ⁇ 54 3 ⁇ 453 "' 9 ) _1 is used for signaling or feedback transmission, and the transmission format is independent of the indication in 0.
- the corresponding transmission format is shown as 0.
- the downlink signaling/feedback transport channel multiplexes the DL-TCH resources, as shown in FIG. All downlink signaling/feedback transport channels share a demodulation pilot.
- Uplink Signaling/Feedback Transport Channel The uplink signaling/feedback transport channel multiplexes UL-TCH resources.
- the uplink signaling/feedback transmission channel can support two structures, as shown in Figures 33 and 34, respectively. In the format 2 of Fig. 34, each basic resource block is 28 ⁇ ⁇ 8 . , (not including phase ⁇ trace pilot). The first 4 OFDM symbols and the last 4 OFDM symbols are frequency hopped as shown. Signaling/Feedback Transmission Channel Resource Indicator-.
- the signaling/feedback transport channel broadcasts the DL-TCH and UL-TCH resources to all STAs in a broadcast manner through CCH broadcast scheduling signaling.
- the broadcast scheduling signaling uses control channel resources and has the same packet size as the control channel scheduling signaling, using the same transmission format (see Table 2).
- Broadcast Scheduling Signaling The CRC check is scrambled with the BSTAID defined by the MAC layer. The specific field definitions are shown in Table 6.
- the number of OFDM symbols occupied by the downlink signaling feedback channel is D
- b2 ''' 3 ⁇ 423 index is an OFDM symbol for the common demodulation pilot occupied resources.
- the CRC is defined as in Table 1.
- the CAP can allocate a signaling/feedback transmission channel to the STA by signaling as shown in Table 7.
- K b 2i--- ' indicates that the STA is channel 1 at the start of the signaling/feedback channel, and the value of the field ranges from 0 to 63.
- b 3l b 30 b 29 indicating the number of signaling/feedback channels occupied, field value: 1 ⁇ 7;
- a field value of 0 indicates that the channel indication is invalid.
- b 43 b 42 ---b 32 indicating STAID
- the value of the field value ranges from 0 to 63.
- b 55 b 54 b 53 indicating the number of signalling/feedback channels occupied, field value: 1 ⁇ 7;
- a field value of 0 indicates that the channel indication is invalid.
- the uplink signaling feedback transmission channel format 1, D ⁇ 28 bl1 ⁇ ⁇ ⁇ ) indicates the first OFDM symbol corresponding to the STA uplink signaling feedback transmission channel, D ⁇ 2 ⁇ 27 ''' 023 ) -1 corresponding OFDM
- the symbol is the demodulation pilot of the STA uplink signaling feedback transmission channel.
- D b2 & bl1 ⁇ ' S ) ° is an invalid indication.
- the downlink signaling feedback transmission channel and the uplink signaling feedback transmission channel format 1, each OFDM symbol is one signaling/feedback channel; the uplink signaling feedback transmission channel format 2, and each resource block is a signaling/feedback channel.
- this frame configures the downlink sounding channel.
- the specific location of the downlink sounding channel on the downlink transport channel and the downlink sounding channel pilot pattern are indicated by the MAC layer BCF frame (Table 2).
- Downlink detection pilot pattern The number of logical antenna ports that the downlink sounding channel can support is 1 ⁇ 8, and the pilot pattern is as follows:
- Table 9 defines the subcarrier positions corresponding to the pilot symbols in the demodulation pilot pattern.
- SC s i p l [ ⁇ (1 + ti (/ 1) . SPI)), ⁇ (1 + SPI + ti (/ 1) . SPI)), ... , + ti (/ 1) . SPI) )] 1 tl
- N l + SPI- (N sr - ti + (/ - 1) . SPI - 1) / 5 ⁇ /"
- ⁇ is the set of subcarrier indices occupied by the first antenna port sounding pilot
- the pilot sequence generator polynomial is 1 + + 15 .
- the initial state of the register is:
- MSB is on the left and LSB is on the right.
- Is the CAP's MAC address is the most 4 ⁇ 7 bits.
- the uplink probe pilot port is shown in Table 10.
- the CAP allocates an uplink sounding channel to the STA through the signaling shown in Table 11.
- MSB is on the left and LSB is on the right.
- "6 " 5 ⁇ "° is the most 4 ⁇ 7 bits of the CAP's MAC address.
- the set of uplink probe ports allocated by the CAP for the STA is:
- SP i(k,l) ⁇ ke [-115,+115l, / e ⁇ ,3 ⁇ ) ⁇ ⁇ , , ⁇ ⁇ ⁇ ⁇ ⁇ . 3 , , , ⁇
- L “ L” where is the subcarrier index in Table 10, Z is the OFDM symbol index in Table 1C, is the STA antenna port index, and P ort is the uplink sounding pilot port index.
- the uplink sounding pilot is mapped to the following rules. Time-frequency resources.
- the uplink scheduling request signal is generated in accordance with the method shown in FIG.
- CAP-MAC refers to the lowest 7 bits of the CAP's MAC address, which is the PN sequence index (0 ⁇ ⁇ 4), ⁇ (5 CS ⁇ is the cyclic shift parameter set, _/ is the cyclic shift parameter index ( 0 ⁇ _/ ⁇ 8).
- the PN sequence uses a sequence of maximum length linear feedback shift registers with a generator polynomial of 1 +.
- the block diagram is shown in Figure 36.
- the modulation mapping sequence S t is BPSK-modulated
- the sequence C t is obtained.
- the subcarrier mapping sequence performs subcarrier mapping according to the following equation to obtain a sequence ⁇ '.
- the frequency domain cyclic shift is performed on the subcarrier-mapped sequence ⁇ , and is cyclically shifted according to the following equation to obtain the sequence ⁇ .
- TJ k M. k e ⁇
- N is the number of points in IFFT, kei]
- ⁇ 5 is the cyclic shift parameter
- the CAP allocates the UL-TCH resource occupied by the independent resource request frame to the STA by signaling as shown in Table 12.
- V3 ⁇ 4 00, corresponding to the scheduling request of the first OFDM symbol of UL-SRCH
- V3 ⁇ 4 01, corresponding to the scheduling request of the second OFDM symbol of UL-SRCH
- V3 ⁇ 4 10, corresponding to the scheduling request of the 3rd OFDM symbol of UL-SRCH
- V3 ⁇ 4 ll, the scheduling request corresponding to the 4th OFDM symbol of the UL-SRCH b n b l0 , PN sequence index, domain value: 0-3 allocation 1 b l4 b l3 b l2 , PN sequence frequency domain cyclic shift cable 1
- the system frame number of the scheduling request occurs the lowest 3 bits indicate b 2 H
- the resources allocated for the scheduling request are in the signaling /initial position index of the feedback channel
- the value of the field value ranges from 1 to 63
- the value of field 0 indicates invalid indication... b 25 b 24 , definition of the same assignment 2 b 21 b 26 , PN sequence index, field value: 0 ⁇ 3 b 30 b 29 b 2S , PN sequence frequency domain cyclic shift cable 1
- the resource to be allocated is indexed at the beginning of the signaling/feedback channel.
- the value of the field is in the range of 1 to 63.
- the value in the field is 0.
- the random access signal is generated in the same manner as the uplink scheduling request signal.
- the sequence index number of the uplink random access signal and the cyclic shift index number ⁇ , _/ ⁇ are randomly selected by each STA.
- Random access channel format Format 1 is shown in Figure 37.
- the CAP allocates the UL-TCH resource occupied by the random access request frame to the STA by signaling as shown in Table 13.
- the transmission timing advance amount b 3l b 30 - - -b 26 the resource allocated by the random access request is indexed at the start position of the signaling/feedback channel, and the value of the field value ranges from 1 to 63, the field value of 0 means invalid indication b 33 b 32 , PN sequence index, 0 ⁇ 3 b 36 b 35 b 34 , PN sequence frequency domain cyclic shift cable 1
- the CAP indicates the DL-TCH resource occupied by the random access response frame for the STA by signaling as shown in Table 14.
- b 3 b 2 b, b 0 0101, random access response frame (allocation resource for random access response frame) reserved, PN sequence index, 0 ⁇ 3 b n A. , PN sequence frequency domain cyclic shift cable 1
- the resource allocated for the random access response is indexed at the start position of the signaling/feedback channel, the field value ranges from 1 to 63, and the field value is 0 indicates invalid indication b 23 b 2 2 ' Reserved 39 38... 24 b 25 b 24 , PN sequence index, field value 0 ⁇ 3 allocation 2 b 2 , b 27 b 26 , PN sequence frequency domain cyclic shift cable 1
- the poor source ⁇ signaling / anti-inertial signal assigned to the 13 ⁇ 4 machine access Starting position index, field value range 1 63, field value 0 means invalid indication
- the resource allocated for the random access response is indexed at the start position of the signaling/feedback channel, the value of the field is in the range of 1 to 63, and the value of the field is 0, indicating that the indication is invalid b 55 b 54 , reserved
- PSTA min ⁇ ⁇ PL 0L +C/N + 10 log 10 (BW) ⁇ (dBm) where -.
- P ⁇ 0L Transmission path loss estimate.
- the signal power and CAP transmission power estimate can be estimated according to the STA.
- the CAP transmit power is indicated in the MAC layer BCF frame.
- C/N The carrier-to-noise ratio corresponding to different MCS.
- BW The transmission bandwidth allocated by the CAP to the STA.
- the embodiment of the invention provides a resource indication method for indicating signaling and/or feedback transmission Source, including:
- Step 1 Generate scheduling signaling, where the scheduling signaling carries indication information indicating resources used for signaling and/or feedback transmission in the user resource group; the user resource group is used for user service data transmission;
- Step 2 Send the scheduling signaling.
- the scheduling signaling further carries indication information for indicating a starting location and a length of the user resource group.
- the resources used for signaling and/or feedback transmission are multiplexed with the user transmission resources, and the signaling feedback channel is multiplexed with the transmission channel according to the resource scheduling.
- Scheduling signaling format Table 2 to b 53 ⁇ index indicating the traffic transmitted from the STA resource group is 1 3 ⁇ 453 ⁇ ⁇ ⁇ 49) of the OFDM symbol start transmitting packet data and pilot demodulation.
- D ⁇ 54 ⁇ ' ⁇ 9 ) is the corresponding decimal number of b 53 ⁇ , where 3 ⁇ 454 is high and 3 ⁇ 449 is 4 ⁇ .
- OFDM symbol 0 to OFDM symbol 1 ⁇ 054 053 ... 049 ) -1 are used for signaling or feedback transmission, and the OFDM symbol indexed as D b54 from the STA resource group.
- When transmitting signaling and/or feedback information it is transmitted in accordance with a double-ended agreed signaling and/or feedback transmission format.
- the embodiment of the present invention further provides a resource indication device, including:
- the encapsulating module is configured to generate scheduling signaling, where the scheduling signaling carries indication information indicating resources used for signaling and/or feedback transmission in the user resource group; the user resource group is used for user service data transmission;
- a sending module configured to send the scheduling signaling.
- the scheduling signaling further carries indication information for indicating a starting location and a length of the user resource group.
- the scheduling signaling further indicates that the transmission is performed according to a preset signaling and/or feedback transmission format.
- an embodiment of the present invention further provides a data sending method, which is used to receive the foregoing scheduling.
- the signaling includes: Step 1: receiving scheduling signaling, where the scheduling signaling carries indication information indicating resources used for signaling and/or feedback transmission in the user resource group; User data transmission;
- Step 2 According to the indication information, transmit signaling and/or feedback messages at corresponding locations in the user resource group.
- an embodiment of the present invention further provides a data sending apparatus, including: a receiving module, configured to receive scheduling signaling, where the scheduling signaling carries an indication in a user resource group for signaling and/or Or feedback information indicating the transmitted resource; the user resource group is used for user service data transmission;
- a sending module configured to transmit, according to the indication information, a signaling and/or a feedback message at a corresponding location in the user resource group.
- the sending module is configured to transmit according to a preset signaling and/or feedback transmission format.
- the embodiment of the present invention provides a resource indication method, which is used to indicate signaling and/or feedback transmission resources, and includes: Step 1: generating first scheduling signaling, where the first scheduling signaling is used to indicate signaling And/or information about the resources transmitted by the feedback;
- Step 2 Send the first scheduling signaling.
- the information indicating the signaling and/or the resource for the feedback transmission includes a starting position and a length.
- the information indicating the signaling and/or the resource for feedback transmission includes a format, where the format is used to indicate a manner of resource multiplexing.
- the manner of multiplexing the resources may be time division multiplexing, frequency division multiplexing, time frequency multiplexing, or code division multiplexing.
- the information indicating the signaling and/or the resource for the feedback transmission includes a subchannel or a subcarrier indicating that the first scheduling signaling is applicable in the spectrum aggregation mode.
- Steps 2 and 4 are also included after step 2 above: Step 3: Generate second scheduling signaling, where the second scheduling signaling carries information for allocating signaling and/or feedback transmission resources, indicating signaling and/or feedback transmission resources allocated for each user; Step 4: Send the second scheduling signaling.
- the information about the resource allocated for signaling and/or feedback transmission includes one or more user identification STAIDs, and a starting position and length of the corresponding STA in the signaling and/or feedback transmitted resources.
- the STAID can be used to uniquely identify a STA.
- the STAID may also be a broadcast ID identifier.
- the broadcast ID identifier is an ID identifier shared by all STAs, and each STA can receive a corresponding signaling by using the broadcast ID identifier.
- the length of the STA may be indicated by indicating the number of signaling and/or feedback channels occupied by the STA.
- the unit length of each signaling and/or feedback channel is 1 OFDM symbol (mode 1, instant division multiplexing) or 1 unit resource block (mode 2, instant frequency multiplexing).
- resources for signaling and/or feedback transmission are independent of user transmission resources.
- the first scheduling signaling may be as shown in Table 6, and the second scheduling signaling may be as shown in Table 7.
- the two transmission modes shown in Figure 33 and Figure 34 are supported.
- the embodiment of the present invention further provides a resource indication device, including:
- a first encapsulating module configured to generate first scheduling signaling, where the first scheduling signaling carries information for indicating signaling and/or feedback transmission; and a first sending module, configured to send the first Scheduling signaling.
- the information indicating the signaling and/or the resource for the feedback transmission includes a starting position and a length.
- the information indicating the signaling and/or the resource for feedback transmission further includes a format, where the format is used to indicate a manner of resource multiplexing.
- the manner of multiplexing the resources may be time division multiplexing, frequency division multiplexing, time frequency multiplexing, or code division multiplexing.
- the information indicating the signaling and/or the resource for the feedback transmission includes a subchannel or a subcarrier indicating that the first scheduling signaling is applicable in the spectrum aggregation mode.
- the resource indication device further includes:
- a second encapsulating module configured to generate second scheduling signaling, where the second scheduling signaling carries information for allocating signaling and/or feedback transmission resources, indicating signaling and/or feedback allocated for each user Transmitted resources;
- the second sending module is configured to send the second scheduling signaling.
- the information about the resource allocated for signaling and/or feedback transmission includes one or more user identification STAIDs, and a starting position and length of the corresponding STA in the signaling and/or feedback transmitted resources.
- the STAID can be used to uniquely identify a STA.
- the STAID may also be a broadcast ID identifier.
- the length of the STA is indicated by indicating the number of signaling and/or feedback channels occupied by the STA.
- the unit length of each signaling and / or feedback channel is 1 OFDM symbol (mode 1, see Figure 33) or 1 unit resource block (mode 2, see Figure 34).
Abstract
Description
Claims
Priority Applications (7)
Application Number | Priority Date | Filing Date | Title |
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CN201280012812.7A CN103621169A (zh) | 2011-03-25 | 2012-03-22 | 一种资源调度方法和设备 |
KR1020137028292A KR20140031239A (ko) | 2011-03-25 | 2012-03-22 | 리소스 스케쥴링 방법과 설비 |
JP2014501415A JP2014515208A (ja) | 2011-03-25 | 2012-03-22 | リソーススケジューリング方法及び機器 |
CN201811269770.0A CN109587808B (zh) | 2011-03-25 | 2012-03-22 | 一种无线通信资源调度方法及装置 |
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CN108401277B (zh) * | 2018-01-19 | 2020-07-17 | 京信通信系统(中国)有限公司 | 无线网络接入的方法及装置、终端设备 |
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