WO2016106776A1 - Procédé de transmission de données et dispositif associé - Google Patents

Procédé de transmission de données et dispositif associé Download PDF

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Publication number
WO2016106776A1
WO2016106776A1 PCT/CN2015/070056 CN2015070056W WO2016106776A1 WO 2016106776 A1 WO2016106776 A1 WO 2016106776A1 CN 2015070056 W CN2015070056 W CN 2015070056W WO 2016106776 A1 WO2016106776 A1 WO 2016106776A1
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Prior art keywords
channel
scheduled
sta
uplink data
user equipment
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PCT/CN2015/070056
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English (en)
Chinese (zh)
Inventor
刘乐
林英沛
李彦淳
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华为技术有限公司
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Priority to PCT/CN2015/070056 priority Critical patent/WO2016106776A1/fr
Publication of WO2016106776A1 publication Critical patent/WO2016106776A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA

Definitions

  • the present invention relates to the field of wireless communication technologies, and in particular, to a data transmission method and device.
  • Wi-Fi systems in wireless local area networks have evolved from IEEE 802.11a/b systems to 802.11g systems, 802.11n systems, to 802.11ac systems.
  • the next-generation Wi-Fi 802.11ax system not only needs to consider indoor and outdoor scenarios, but also meets the requirements for further improving spectrum utilization.
  • the channel bandwidth is divided into a primary channel and a secondary channel, and the signal transmission bandwidth is increased to increase the peak rate of data transmission.
  • This approach requires competing access on the primary carrier first.
  • the order of carrier contention access is the primary carrier channel, the secondary 20 MHz channel, the secondary 40 MHz channel, and the secondary 80 MHz channel, as shown in FIG.
  • an access point (AP) or a user equipment (Station, STA) will compete for the latter channel only when the previous channel in the above sequence allows access.
  • the channels that are allowed to access are combined to form a large bandwidth channel to transmit data.
  • the access management of a basic service set (BSS) and the management of different STAs are implemented only through the primary channel.
  • the Overlapped Basic Service Set (OBSS) uses the primary channel on the same frequency resource.
  • This channel aggregation method in the 802.11 standard combines the channels obtained by each competition into a fixed large-bandwidth channel, and thus can only configure the data transmission of the entire bandwidth.
  • the minimum primary channel 20 MHz is relatively fixed. If severe interference occurs on the primary channel, the control information transmission of the entire BSS may be problematic, thus affecting the transmission of all STAs associated with the BSS.
  • the OBSS uses the same frequency resource as the primary channel, all overlapping BSSs need to initiate the transmission after the contention in the primary channel is successful.
  • the effective usage rate of the frequency resource for the OBSS decreases as the number of overlapping BSS increases. , thus affecting the management efficiency of a single BSS. Even if there is an idle secondary channel, since the primary channel is already occupied, the STA of the BSS cannot utilize the idle channel, resulting in waste of spectrum resources.
  • the STA in the channel aggregation mode adopted by the existing 802.11 system, as long as the primary channel is occupied, even if there is an idle secondary channel, the STA cannot use the idle secondary channel for data transmission, thereby causing waste of spectrum resources.
  • the present invention discloses a data transmission method and device, which solves the channel aggregation method adopted by the existing 802.11 system. As long as the primary channel is occupied, even if there is an idle secondary channel, the STA cannot use the idle secondary channel for data. The problem of wasted spectrum resources caused by transmission.
  • a data transmission method comprising:
  • the first user equipment STA determines that it needs to perform data transmission
  • the first STA determines that it is not scheduled by the AP, and determines that the AP is in the network allocation vector NAV protection time of the transmission configuration of the scheduled uplink data, there is an idle state and is not in the AP
  • the first channel occupied by the scheduled uplink data, the first STA contending for the first channel, and after the contention is successful, data transmission is performed by using the first channel.
  • the first STA determines that it needs to perform data transmission, it does not send a scheduling request to the AP, directly determines that it is not scheduled by the AP, and determines that the During the NAV protection period, is there a first channel that is in an idle state and is not occupied by uplink data scheduled by the AP.
  • the method further includes:
  • the first STA sends a scheduling request to the AP to request the AP to schedule data to be transmitted by the first STA.
  • the first STA determines that it is not scheduled by the AP, including:
  • the first STA After the first STA sends the scheduling request to the AP, if the scheduling information sent by the AP is not received within the set time period, the first STA determines that it is not scheduled by the AP;
  • the first STA sends a scheduling request to the AP, if the setting is Receiving, by the AP, the scheduling information sent by the AP, and the scheduling information does not include information for identifying the first STA, where the first STA determines that it is not scheduled by the AP;
  • the scheduling information includes information used to identify STAs scheduled by the AP.
  • the first STA determines the NAV protection time a first channel that is in an idle state and is not occupied by uplink data scheduled by the AP, and includes:
  • the first STA monitors a channel occupied by uplink data that is not scheduled by the AP, to determine whether there is an idle state in a channel occupied by uplink data that is not scheduled by the AP. First channel.
  • the method further includes:
  • the first STA triggers a radio frame by using data, and receives the scheduling information sent by the AP.
  • the first STA determines the NAV During the protection time, there is a first channel that is in an idle state and is not occupied by the uplink data scheduled by the AP, and includes:
  • the first STA listens to all channels during the NAV protection time to determine whether there is a first channel that is in an idle state and is not occupied by uplink data scheduled by the AP.
  • the first STA passes the The first channel performs data transmission, including:
  • the first STA After the contention is successful, the first STA sends an uplink to the AP by using the first channel. Data; or,
  • the first STA After the contention is successful, the first STA sends data to the second STA that has established device-to-device D2D communication through the first channel.
  • the first STA performs data by using the first channel Transmission, including:
  • the first STA reserves a set guard frequency band on the first channel, and sets data to be transmitted after the protection frequency band is transmitted.
  • the method further includes:
  • the first STA continues to wait for the scheduling of the AP.
  • the method further includes:
  • the first STA configures the AP for itself. Data transmission is performed on the second channel for transmitting uplink data.
  • the first channel is a primary channel or a secondary channel .
  • a data transmission method includes:
  • the access point AP is a channel occupied by uplink data scheduling of the user equipment STA connected to itself;
  • the AP receives the uplink data sent by the scheduled STA on the scheduled channel, and receives the uplink data sent by the STA that is not scheduled by the AP on the first channel, where the first channel is the AP
  • the network allocation vector of the scheduled uplink data transmission configuration is in the idle state and is not occupied by the uplink data scheduled by the AP.
  • a third aspect is a user equipment STA, where the user equipment includes:
  • a first processing module configured to determine that a user equipment to which the user equipment belongs needs to perform data transmission
  • a second processing module configured to determine that the user equipment is not scheduled by the access point AP, and determine that the AP is in idle time during a network allocation vector NAV protection time of the transmission configuration of the scheduled uplink data. And when the first channel occupied by the uplink data scheduled by the AP is not occupied, the first channel is contending, and after the contention is successful, data transmission is performed by using the first channel.
  • the first processing module is configured to: after the first processing module determines that the user equipment needs to perform data transmission, does not send a scheduling request to the AP;
  • the second processing module is configured to: directly determine that the user equipment is not scheduled by the AP, and determine whether there is an uplink data that is in an idle state and is not occupied by the uplink data scheduled by the AP during the NAV protection time. First channel.
  • the first processing module is further configured to:
  • the second processing module determines that the user equipment is not Dispatched by the AP, including:
  • Determining that the user equipment is not scheduled by the AP if the scheduling information sent by the AP is received and the scheduling information does not include information for identifying the user equipment. ;
  • the scheduling information includes information used to identify STAs scheduled by the AP.
  • the second processing module determines the NAV protection time Inside, there is a first letter that is in an idle state and is not occupied by uplink data scheduled by the AP. Road, including:
  • the scheduling information sent by the AP includes information about a channel occupied by the uplink data scheduled by the AP, and determining, according to the scheduling information, that the uplink data that is not scheduled by the AP is occupied by a channel, in the NAV protection time, listening to a channel occupied by uplink data not scheduled by the AP, to determine whether there is a first channel in an idle state in a channel occupied by uplink data scheduled by the AP .
  • the second processing module is configured to:
  • the radio frame is triggered by data, and the scheduling information sent by the AP is received.
  • the second processing module determines that During the NAV protection period, there is a first channel that is in an idle state and is not occupied by uplink data scheduled by the AP, and includes:
  • all channels are monitored to determine if there is a first channel that is in an idle state and is not occupied by uplink data scheduled by the AP.
  • the second processing module passes the The first channel performs data transmission, including:
  • the second processing module is performed by using the first channel Data transfer, including:
  • the second processing module is further configured to: if the scheduling information sent by the AP is not received within the set time period, continue to wait for the scheduling information The scheduling of the AP.
  • the second processing module is further configured to: If the scheduling information sent by the AP is received within the set time period, and the scheduling information includes information for identifying the user equipment, the AP is configured for the user equipment. Data transmission is performed on the second channel on which the uplink data is transmitted.
  • an access point AP includes:
  • a scheduling module configured to schedule a channel occupied by uplink data of a user equipment STA connected to an access point to which the user belongs;
  • a receiving module configured to receive uplink data sent by the scheduled STA on the scheduled channel, and receive uplink data sent by the unscheduled STA of the access point on the first channel, where the first channel is The access point is a channel occupied by the uplink data in which the network allocation vector NAV protection time of the scheduled uplink data transmission is in an idle state and is not scheduled by the access point.
  • a user equipment includes: a processor and a transceiver, wherein:
  • a processor configured to determine that the user equipment is not assigned to an access point AP, and determine that the AP is in an idle state during a network allocation vector NAV protection time of the transmission configuration of the scheduled uplink data.
  • the first channel occupied by the uplink data scheduled by the AP is not occupied, the first channel is contending, and after the contention is successful, the transceiver is instructed to perform data transmission by using the first channel.
  • the processor is configured to:
  • the transceiver After determining that the user equipment needs to perform data transmission, the transceiver is not triggered to send a scheduling request to the AP, directly determining that the user equipment is not scheduled by the AP, and determining whether the presence or absence is in the NAV protection time.
  • the transceiver is further configured to:
  • the processor determines that the user equipment is not the AP Scheduling, including:
  • the transceiver does not receive the scheduling information sent by the AP during the set time period, determining that the user equipment is not scheduled by the AP; or
  • the transceiver receives the scheduling information sent by the AP and the scheduling information does not include information for identifying the user equipment, determining that the user equipment is not The AP scheduling;
  • the scheduling information includes information used to identify STAs scheduled by the AP.
  • the transceiver is further configured to: receive the AP Transmitted scheduling information, where the scheduling information includes information about a channel occupied by uplink data scheduled by the AP;
  • Determining, by the processor, that the first channel is in an idle state and is not occupied by the uplink data scheduled by the AP includes:
  • the transceiver is configured to: trigger a radio frame by using data, and receive the The scheduling information sent by the AP.
  • the processor determines that, in the NAV protection time, there is a first channel that is in an idle state and is not occupied by uplink data scheduled by the AP. ,include:
  • all channels are monitored to determine if there is a first channel that is in an idle state and is not occupied by uplink data scheduled by the AP.
  • the processor indicates the sending and receiving Transmitting data through the first channel, including:
  • the transceiver After the contention is successful, the transceiver is instructed to send data to the user equipment that has established device-to-device D2D communication with the user equipment through the first channel.
  • the processor instructs the transceiver to pass the One channel for data transmission, including:
  • the processor is further configured to:
  • the transceiver does not receive the scheduling information sent by the AP within a set period of time, it continues to wait for the scheduling of the AP.
  • the processor is further configured to:
  • the transceiver receives the scheduling information sent by the AP in the set time period, and the scheduling information includes information used to identify the user equipment, indicating that the transceiver is in the
  • the AP performs data transmission on the second channel configured by the user equipment for transmitting uplink data.
  • an access point AP includes:
  • a processor configured to schedule a channel occupied by uplink data of a user equipment STA connected to an access point to which the user belongs;
  • a receiver configured to receive uplink data sent by the scheduled STA on the scheduled channel, and receive uplink data sent by the unscheduled STA of the access point on the first channel, where the first channel is The access point is a channel occupied by the uplink data in which the network allocation vector NAV protection time of the scheduled uplink data transmission is in an idle state and is not scheduled by the access point.
  • the first STA that needs to perform data transmission determines that it is not scheduled by the AP according to the indication of the associated AP, and determines that the AP is configured for the transmission of the scheduled uplink data.
  • the protection time when there is a first channel that is in an idle state and is not occupied by uplink data scheduled by the AP, the first channel is contending, and after the contention is successful, data is transmitted through the first channel, thereby Increased flexibility in system access and increased spectrum utilization.
  • FIG. 1 is a schematic diagram of existing channel aggregation in an 802.11 system
  • FIG. 2 is a schematic diagram of a data transmission method on a STA side of a user equipment according to an embodiment of the present invention
  • FIG. 3 is a schematic diagram of a data transmission method on an AP side of an access point according to an embodiment of the present disclosure
  • FIG. 4 is a schematic diagram of an application scenario according to Embodiment 1 of the present disclosure.
  • FIG. 5 is a schematic flowchart of a process according to Embodiment 1 of the present disclosure.
  • FIG. 6 is a schematic diagram of an application scenario of Embodiment 2 according to an embodiment of the present disclosure.
  • FIG. 7 is a schematic flowchart of a process according to Embodiment 2 of the present disclosure.
  • FIG. 8 is a schematic diagram of an application scenario of Embodiment 3 according to an embodiment of the present disclosure.
  • FIG. 9 is a schematic flowchart of a process of Embodiment 3 according to an embodiment of the present disclosure.
  • FIG. 10 is a schematic diagram of a first user equipment STA according to an embodiment of the present disclosure.
  • FIG. 11 is a schematic diagram of a first access point AP according to an embodiment of the present disclosure.
  • FIG. 12 is a schematic diagram of a second user equipment STA according to an embodiment of the present disclosure.
  • FIG. 13 is a schematic diagram of a second access point AP according to an embodiment of the present invention.
  • the STA sets the guard time through the Network Allocation Vector (NAV) in time to transmit data to notify the neighboring nodes that the data in the time period is protected.
  • NAV Network Allocation Vector
  • the STA can support uplink multi-user transmission of AP scheduling, such as Orthogonal Frequency Division Multiple Access (OFDM)/Multiple User Multiple Input Multiple Output (Multi-user MIMO, MU- MIMO (Multiple Input Multiple Output, MIMO), after a long period of uplink multi-user data transmission, unified acknowledgement (ACK) feedback to the scheduled multi-user, so during the scheduled NAV protection of uplink transmission,
  • OFDM Orthogonal Frequency Division Multiple Access
  • Multi-user MIMO Multiple User Multiple Input Multiple Output
  • MU- MIMO Multiple Input Multiple Output
  • ACK unified acknowledgement
  • the invention is based on the different characteristics of distinguishing the transmission and reception time periods of the AP, and proposes a process for the wireless local area network node to distinguish the uplink and downlink and the frequency division channel NAV protection setting, in the present invention, for the next generation 802.11ax system.
  • An AP which has multiple parallel receiving capabilities, that is, the AP can receive uplink data of the primary channel and the secondary channel in parallel, and the AP can schedule multiple users, that is, schedule a channel that the STA configures for the AP.
  • the AP For the next-generation 802.11ax system, if the STA is scheduled by the AP, the AP performs uplink data transmission on the channel (primary channel or secondary channel) configured by the AP.
  • the STA is allowed to actively advertise an idle channel (primary channel or secondary channel) during the uplink NAV protection period, thereby improving channel aggregation.
  • the flexibility also improves the efficiency of uplink data transmission, which greatly satisfies the requirements of the next generation 802.11ax (High Efficiency WLAN (HEW)) system to improve spectrum utilization.
  • HEW High Efficiency WLAN
  • a data transmission method of a user equipment STA side includes the following steps:
  • the first STA determines that it needs to perform data transmission.
  • the first STA determines that it needs to perform data transmission, and may send uplink data to the AP to which it belongs, or may send data to the second STA that establishes device to device (D2D) communication with itself.
  • D2D device to device
  • the idle state is not in the idle state.
  • the first channel occupied by the uplink data scheduled by the AP, the first STA contending for the first channel, and after the contention is successful, data transmission is performed by using the first channel.
  • the NAV guard time may be carried in the Duration field in the existing signaling field (Signaling, SIG), and the NAV indicates the duration that the channel occupied by the uplink data scheduled by the AP is busy.
  • the first STA that needs to perform data transmission determines that it is not scheduled by the AP, and determines that the AP is in an idle state during the NAV protection time of the transmission configuration of the scheduled uplink data.
  • the first channel occupied by the uplink data that is not scheduled by the AP is used, the first channel is contending, and after the contention is successful, data is transmitted through the first channel, thereby improving system access flexibility. Improved spectrum utilization.
  • the "first STA” and the “second STA” are used to distinguish different STAs, but the number of STAs and the operation priority are not limited.
  • the first STA indicates the 802.11ax system. Any STA, the second STA represents any STA that establishes D2D communication with the first STA.
  • the first channel determined by the first STA is a primary channel or a secondary channel.
  • the first STA After determining that the first STA needs to perform data transmission, the first STA performs the following two according to the quality of service (QoS) requirements of the data to be transmitted.
  • QoS quality of service
  • Manner 1 After the first STA determines that it needs to perform data transmission, it does not send a scheduling request to the AP, directly determines that it is not scheduled by the AP, and determines whether there is an idle state in the NAV protection time. The first channel occupied by the uplink data scheduled by the AP to compete for the first channel.
  • the first STA may not send a scheduling request to the AP to which it belongs, but directly determine that it is not the AP. Scheduling. Further, if the first STA detects an information frame that is sent by the AP to schedule uplink data, the NAV is determined in the NAV protection time of the transmission configuration of the scheduled uplink data. During the guard time, is there a first channel that is in an idle state and is not occupied by uplink data scheduled by the AP.
  • Manner 2 The first STA sends a scheduling request to the AP, to request the AP to schedule data to be transmitted by the first STA.
  • the first STA sends a request message to the AP.
  • the first STA determines that it is not scheduled by the AP, and includes:
  • the first STA After the first STA sends the scheduling request to the AP, if the scheduling information sent by the AP is not received within the set time period, the first STA determines that it is not scheduled by the AP;
  • the first STA determines that it is not scheduled by the AP;
  • the scheduling information includes information used to identify STAs scheduled by the AP. For example, an identifier (IDentifier, ID), a medium access control (MAC) address information, or an STA group ID (group ID) of the STA scheduled by the AP. , GID) and so on.
  • ID identifier
  • MAC medium access control
  • group ID STA group ID
  • the first STA may be used to identify the AP according to the scheduling information sent by the AP.
  • the information of the scheduled STA determines whether it has been scheduled by the AP.
  • the first STA receives the scheduling information sent by the AP by using a data triggering radio frame.
  • the method further includes:
  • the first STA continues to wait for the scheduling of the AP.
  • the first STA After the first STA sends the scheduling request to the AP, if the scheduling information sent by the AP is not received within the set time period, the first STA does not perform the detection of the idle channel. , continue to wait for the scheduling of the AP.
  • the method further includes:
  • the first STA configures the AP for itself. Data transmission is performed on the second channel for transmitting uplink data.
  • the processing process of the first STA further includes the following three situations:
  • the first STA does not receive the scheduling information sent by the AP within the set time period, the first STA does not perform the detection of the idle channel, and continues to wait for the AP scheduling.
  • the first STA receives the scheduling information sent by the AP within a set time period, and the scheduling information includes information for identifying the first STA, the first STA is The AP performs data transmission on the second channel configured for transmitting uplink data.
  • the scheduling information includes information used to identify STAs scheduled by the AP.
  • the first STA does not receive the scheduling information sent by the AP within a set time period, or receives the scheduling information sent by the AP within a set time period, and the scheduling information
  • the first STA does not include information for identifying the first STA, and the first STA determines, in the NAV protection time, whether there is a first channel that is in an idle state and is not occupied by uplink data scheduled by the AP. And competing for the first channel for data transmission.
  • the first STA determines that the NAV is in an idle state and is not scheduled by the AP during the NAV protection time.
  • the first channel occupied by the uplink data includes:
  • the first STA monitors a channel occupied by uplink data that is not scheduled by the AP, to determine whether there is an idle state in a channel occupied by uplink data that is not scheduled by the AP. First channel.
  • the information related to the channel occupied by the uplink data scheduled by the AP is the bandwidth information of the uplink data frame scheduled by the AP, and the related information may pass the bandwidth (Band Width, BW) in the HE-SIG.
  • BW Band Width
  • the first STA first determines, according to the scheduling information sent by the AP, a channel that is not occupied by the uplink data scheduled by the AP, and then does not monitor in the NAV protection time.
  • the channel occupied by the uplink data scheduled by the AP determines whether there is a first channel in an idle state in a channel occupied by uplink data scheduled by the AP.
  • the first STA cannot use the partial frequency band that is not used in the channel occupied by the uplink data scheduled by the AP for data transmission, that is, as long as the channel is occupied by the uplink data scheduled by the AP. Even if some of the frequency bands are not used to transmit data, the first STA cannot use the partial frequency band for data transmission.
  • the first STA receives the scheduling information sent by the AP by triggering a radio frame by using a data.
  • the first STA determines that, in the NAV protection time, there is a first channel that is in an idle state and is not occupied by uplink data scheduled by the AP, and includes:
  • the first STA listens to all channels during the NAV protection time to determine whether there is a presence The first channel occupied by the uplink data that is in an idle state and is not scheduled by the AP.
  • the first STA directly listens to all channels during the NAV protection time to determine whether there is a first channel that is in an idle state and is not occupied by uplink data scheduled by the AP. Since the first STA listens to all channels, such that the channel occupied by the uplink data scheduled by the AP, if part of the frequency band is not used to transmit data, the first STA may use the partial frequency band for data transmission.
  • the first STA performs data transmission by using the first channel, including:
  • the first STA After the contention is successful, the first STA sends uplink data to the AP by using the first channel; or
  • the first STA After the contention is successful, the first STA sends data to the second STA that has established device-to-device D2D communication through the first channel.
  • the first STA performs data transmission by using the first channel, including:
  • the first STA reserves a set guard frequency band on the first channel, and sets data to be transmitted after the protection frequency band is transmitted, thereby avoiding data on adjacent channels due to non-synchronization. Transmission causes interference.
  • a data transmission method on an AP of an access point includes the following steps:
  • the AP is a channel occupied by uplink data scheduling of the STA connected to itself.
  • the AP schedules the occupied channel for the uplink data of some or all of the STAs connected to itself according to its own load condition.
  • the AP receives uplink data sent by the scheduled STA on the scheduled channel, and receives uplink data sent by the unscheduled STA of the AP on the first channel, where the first channel is the The AP is in the idle state of the scheduled uplink data transmission configuration and is not occupied by the uplink data scheduled by the AP.
  • the AP receives the scheduled STA sent on the scheduled channel.
  • the channel occupied by the uplink data that is not scheduled by the AP improves the flexibility of system access and improves spectrum utilization.
  • Embodiment 1 is directed to an application scenario in which an auxiliary channel is idle when there is an uplink multi-user transmission scheduled by an AP on the primary channel, as shown in FIG. 4 .
  • This embodiment includes the following processes:
  • 11ax STA2 For the 11ax STA connected to the BSS AP, as shown in FIG. 5, 11ax STA2, by reading the scheduling information in the APtrigger (trigger) frame, it is identified that it is scheduled by the AP, and the uplink data frame scheduled by the AP in the scheduling information is read.
  • the bandwidth information (such as the BW in the HE-SIG, the AP ID, and the indication of the length of the uplink data frame) is used to transmit uplink data on the channel allocated by the AP.
  • 11ax STA2 performs data transmission on the primary channel.
  • 11ax STA3 For the 11ax STA connected to the BSS AP, as shown in FIG. 5, 11ax STA3, by reading the scheduling information in the AP trigger frame, it is recognized that it is not scheduled by the AP, but has uplink data waiting to be sent. 11ax STA3 reads the NAV protection time (for example, the indication of the Duration in the Legacy-SIG) and the bandwidth information of the uplink data frame scheduled by the AP in the scheduling information (such as the indication of the BW, the AP ID, and the uplink data frame length in the HE-SIG). And determining the secondary channel that is not used during the uplink data frame protection time, and listening to the determined secondary channel that is not used.
  • the NAV protection time for example, the indication of the Duration in the Legacy-SIG
  • the bandwidth information of the uplink data frame scheduled by the AP in the scheduling information such as the indication of the BW, the AP ID, and the uplink data frame length in the HE-SIG.
  • a secondary channel that is not used If it is determined that a secondary channel that is not used is idle, it can spontaneously contend for the secondary channel. If the competition is successful, the uplink data frame of the single user can be sent without the AP scheduling. In order to avoid interference with data transmission on adjacent channels due to non-synchronization, a certain protection frequency band (for example, 1-1.5 MHz, depending on the accuracy of the filter) needs to be reserved in the auxiliary channel transmission.
  • a certain protection frequency band for example, 1-1.5 MHz, depending on the accuracy of the filter
  • the uplink and downlink and the differentiated frequency channel are not identified, and the secondary channel that competes for idle is not involved. Because the AP cannot use the idle secondary channel, it cannot receive the uplink data on the primary channel. The track sends the trigger frame. Therefore, for the uplink STA waiting for the AP to schedule, it does not need to identify the uplink and downlink and the differentiated frequency channel during the NAV protection time, and does not participate in the secondary channel that competes for idle.
  • the 11ac STA1 does not have the ability to distinguish between uplink and downlink and differentiate the frequency band within the NAV protection time. If the primary channel is found to be occupied, it does not participate in the competition for the primary channel and the secondary channel. The channel is gone. It can be seen that the solution provided by the embodiment of the present invention does not affect the access of the traditional WiFi user equipment to the primary channel.
  • Embodiment 2 This embodiment is directed to an application scenario in which other secondary channels are idle when there are uplink multi-user transmissions scheduled by the AP on the partial secondary channel, as shown in FIG. 6 .
  • This embodiment includes the following processes:
  • 11ax STA2 of FIG. 7 reads the scheduling information in the AP trigger frame to identify that it is scheduled by the AP, and reads the uplink data frame scheduled by the AP in the scheduling information.
  • the bandwidth information (such as the BW in the HE-SIG, the AP ID, and the indication of the length of the uplink data frame) is used to transmit uplink data on the channel to which the AP is allocated.
  • 11ax STA2 performs data transmission on the partial secondary channel. .
  • 11ax STA3 For the 11ax STA connected to the BSS AP, as shown in the 11ax STA3 of FIG. 7, by reading the scheduling information in the AP trigger frame, it is recognized that it is not scheduled by the AP, but it has uplink data waiting to be transmitted. 11ax STA3 reads the NAV protection time (for example, the indication of the Duration in the Legacy-SIG) and the bandwidth information of the uplink data frame scheduled by the AP in the scheduling information (such as the indication of the BW, the AP ID, and the uplink data frame length in the HE-SIG). It is determined that the secondary channel that is not used during the uplink data frame protection period is judged, and the determined secondary channel that is not used is intercepted.
  • the NAV protection time for example, the indication of the Duration in the Legacy-SIG
  • the bandwidth information of the uplink data frame scheduled by the AP in the scheduling information such as the indication of the BW, the AP ID, and the uplink data frame length in the HE-S
  • a secondary channel that is not used If it is determined that a secondary channel that is not used is idle, it can spontaneously contend for the secondary channel. If the competition is successful, the uplink data frame of the single user can be sent without the AP scheduling. In order to avoid interference with data transmission on adjacent channels due to non-synchronization, a certain protection frequency band (for example, 1-1.5 MHz, depending on the accuracy of the filter) needs to be reserved in the auxiliary channel transmission.
  • a certain protection frequency band for example, 1-1.5 MHz, depending on the accuracy of the filter
  • the uplink and downlink and the differentiated frequency channel are not identified, and the secondary channel that competes for idle is not involved. Because the AP cannot use the idle secondary channel, it cannot receive the uplink data on the primary channel.
  • the track sends the trigger frame, so for the uplink STA waiting for the AP scheduling, during the NAV protection, it does not need to identify the uplink and downlink and the frequency division channel, and does not participate in the spare channel that competes for idle.
  • 11ac STA connected to the BSS AP, as shown in FIG. 7, 11ac STA1, there is no ability to distinguish between uplink and downlink and frequency band in the NAV protection time. If the primary channel is found to be unoccupied, it can continue to participate in the competition primary channel. This does not affect the fair competition of traditional users.
  • Embodiment 3 is directed to an application scenario in which other secondary channels are idle when there are uplink multi-user transmissions scheduled by the AP on the partial secondary channel, as shown in FIG. 8 .
  • This embodiment includes the following processes:
  • the 11ax STA connected to the BSS AP by reading the scheduling information in the AP trigger frame, it is recognized that it is scheduled by the AP, and by reading the uplink data frame scheduled by the AP in the scheduling information.
  • the bandwidth information (such as the BW in the HE-SIG, the AP ID, and the indication of the length of the uplink data frame) is used to transmit uplink data on the allocated channel of the AP.
  • 11axSTA2 performs data transmission on the primary channel.
  • the 11ax STA connected to the BSS AP by reading the scheduling information in the AP trigger frame, it is recognized that it is not scheduled by the AP, but there is uplink data waiting to be transmitted.
  • the NAV protection time for example, the indication of the Duration in the Legacy-SIG
  • the bandwidth information of the uplink data frame scheduled by the AP in the scheduling information such as the BW in the HE-SIG, the AP ID, and the indication of the length of the uplink data frame
  • the secondary channel that is not used in the uplink data frame protection time is determined, and the determined secondary channel that is not used is intercepted.
  • the secondary channel can be automatically contending. If the competition is successful, the D2D data frame for 11ax STA4 in Fig. 9 can be transmitted without the AP scheduling.
  • a certain protection frequency band (for example, 1-1.5 MHz, depending on the accuracy of the filter) needs to be reserved in the auxiliary channel transmission.
  • the transmission power of the D2D is small, and the reserved guard band can be reduced.
  • the uplink and downlink and the differentiated frequency channel are not identified, and the secondary channel that competes for idle is not involved. Since the AP cannot use the idle secondary channel, it cannot receive the uplink data of the primary channel at the same time as the secondary message.
  • the track sends the Trigger frame, so for the uplink STA waiting for the AP to schedule, it does not need to identify the uplink and downlink and the differentiated frequency channel during the NAV protection time, and does not participate in competing for the idle secondary channel.
  • 11ac STA1 does not have the capability of distinguishing uplink and downlink and distinguishing frequency bands within the NAV protection time. If the primary channel is found to be occupied, it does not participate in the competition for the primary channel and the secondary channel. The channel is gone.
  • an embodiment of the present invention provides a user equipment STA.
  • the user equipment includes:
  • the first processing module 101 is configured to determine that the user equipment to which the user equipment belongs needs to perform data transmission
  • the second processing module 102 is configured to determine that the user equipment is not scheduled by the access point AP, and determine that the AP is in the network allocation vector NAV protection time of the transmission configuration of the scheduled uplink data, When the first channel occupied by the uplink data scheduled by the AP is idle, the first channel is contending, and after the contention is successful, data transmission is performed through the first channel.
  • the first processing module 101 is configured to: after determining that the user equipment needs to perform data transmission, not sending a scheduling request to the AP;
  • the second processing module 102 is configured to: directly determine that the user equipment is not scheduled by the AP, and determine whether there is an uplink data that is in an idle state and is not scheduled by the AP during the NAV protection time.
  • the first channel is configured to: directly determine that the user equipment is not scheduled by the AP, and determine whether there is an uplink data that is in an idle state and is not scheduled by the AP during the NAV protection time. The first channel.
  • the first processing module 101 is further configured to:
  • the second processing module 102 determines that the user equipment is not scheduled by the AP, and includes:
  • the scheduling information includes information used to identify STAs scheduled by the AP.
  • the second processing module 102 determines that the first processing module 102 is in an idle state and is not occupied by the uplink data scheduled by the AP during the NAV protection time.
  • Channel including:
  • the scheduling information sent by the AP includes information about a channel occupied by the uplink data scheduled by the AP, and determining, according to the scheduling information, that the uplink data that is not scheduled by the AP is occupied by a channel, in the NAV protection time, listening to a channel occupied by uplink data not scheduled by the AP, to determine whether there is a first channel in an idle state in a channel occupied by uplink data scheduled by the AP .
  • the second processing module 102 is configured to: trigger the radio frame by using data, and receive the scheduling information sent by the AP.
  • the second processing module 102 determines that there is a first channel that is in an idle state and is not occupied by the uplink data scheduled by the AP, and includes:
  • all channels are monitored to determine if there is a first channel that is in an idle state and is not occupied by uplink data scheduled by the AP.
  • the second processing module 102 performs data transmission by using the first channel, including:
  • the second processing module 102 performs data transmission by using the first channel, including:
  • the second processing module 102 is further configured to:
  • the scheduling information sent by the AP is not received within the set time period, the scheduling of the AP is continued.
  • the second processing module 102 is further configured to:
  • the AP is configured for the user equipment. Data transmission is performed on the second channel on which the uplink data is transmitted.
  • an embodiment of the present invention further provides an access point AP.
  • the access point includes:
  • the scheduling module 111 is configured to schedule, by using the uplink data of the user equipment STA connected to the access point to which the user belongs, the occupied channel;
  • the receiving module 112 is configured to receive uplink data sent by the scheduled STA on the scheduled channel, and receive uplink data sent by the unscheduled STA of the access point on the first channel, where the first channel
  • the channel allocated for the transmission of the scheduled uplink data transmission by the access point is a channel occupied by uplink data that is in an idle state and is not scheduled by the access point.
  • the embodiment of the present invention provides another user equipment STA.
  • the user equipment includes: a processor 121 and a transceiver 122, where:
  • the processor 121 is configured to determine that the user equipment is not scheduled by the access point AP, and determine that the AP is in an idle state during a network allocation vector NAV protection time of the transmission configuration of the scheduled uplink data.
  • the first channel occupied by the uplink data scheduled by the AP is not occupied, the first channel is contending, and after the contention is successful, the transceiver 122 is instructed to perform data transmission by using the first channel.
  • the processor 121 is configured to:
  • the transceiver 122 After determining that the user equipment needs to perform data transmission, the transceiver 122 is not triggered to send a scheduling request to the AP, directly determining that the user equipment is not scheduled by the AP, and determining that During the NAV protection period, is there a first channel that is in an idle state and is not occupied by uplink data scheduled by the AP.
  • the transceiver 122 is further configured to:
  • the processor 121 determines that the user equipment is not scheduled by the AP, and includes:
  • the transceiver 122 does not receive the scheduling information sent by the AP during the set time period, it is determined that the user equipment is not scheduled by the AP; or
  • the transceiver 122 receives the scheduling information sent by the AP and the scheduling information does not include information for identifying the user equipment, the determining that the user equipment is not Being scheduled by the AP;
  • the scheduling information includes information used to identify STAs scheduled by the AP.
  • the transceiver 122 is further configured to: receive scheduling information sent by the AP, where the scheduling information includes a channel occupied by uplink data scheduled by the AP. Related information;
  • the processor 121 determines that there is a first channel that is in an idle state and is not occupied by the uplink data scheduled by the AP, and includes:
  • the transceiver 122 is configured to: trigger the radio frame by using data, and receive the scheduling information sent by the AP.
  • the processor 121 determines that there is a first channel that is in an idle state and is not occupied by the uplink data scheduled by the AP, and includes:
  • all channels are monitored to determine if there is a first channel that is in an idle state and is not occupied by uplink data scheduled by the AP.
  • the processor 121 after the contention is successful, instructs the transceiver 122 to perform data transmission by using the first channel, including:
  • the transceiver 122 is instructed to send uplink data to the AP by using the first channel;
  • the transceiver 122 is instructed to send data to the user equipment that has established the device-to-device D2D communication with the user equipment through the first channel.
  • the processor 121 instructs the transceiver 122 to perform data transmission by using the first channel, including:
  • the processor 121 is further configured to:
  • the transceiver 122 does not receive the scheduling information sent by the AP within a set period of time, it continues to wait for the scheduling of the AP.
  • the processor 121 is further configured to:
  • the transceiver 122 receives the scheduling information sent by the AP in the set time period, and the scheduling information includes information used to identify the user equipment, indicating that the transceiver 122 is
  • the AP performs data transmission on a second channel configured by the user equipment for transmitting uplink data.
  • the embodiment of the present invention further provides another access point AP, as shown in FIG. 13, the access point includes:
  • the processor 131 is configured to schedule, by using the uplink data of the user equipment STA connected to the access point to which the user belongs, the occupied channel;
  • the receiver 132 is configured to receive uplink data sent by the scheduled STA on the scheduled channel, where And receiving, on the first channel, uplink data sent by the unscheduled STA of the access point, where the first channel is a network allocation vector NAV protection time configured by the access point for transmission of the scheduled uplink data.
  • embodiments of the present invention can be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or a combination of software and hardware. Moreover, the invention can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) including computer usable program code.
  • computer-usable storage media including but not limited to disk storage, CD-ROM, optical storage, etc.
  • the computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device.
  • the apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.
  • These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device.
  • the instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.

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

Abstract

L'invention concerne un procédé de transmission de données et un dispositif associé visant à remédier au problème du gaspillage des ressources du spectre des fréquences dû à l'incapacité d'une station (STA) à utiliser un canal secondaire disponible pour la transmission de données tant qu'un canal primaire est occupé dans un mode d'agrégation de canaux adopté par un système en place, conforme à la norme 802.11. Le procédé comprend les étapes suivantes : détermination, par une première station, de la nécessité d'exécuter une transmission de données ; et, si la première station détermine qu'elle n'a pas fait l'objet d'un ordonnancement par un point d'accès (AP) et qu'il existe un premier canal qui se trouve dans un état de disponibilité et qui n'est pas occupé par des données de liaison montante ordonnancées par le point d'accès au sein d'un intervalle de temps de protection par vecteur d'allocation réseau (NAV) configuré par le point d'accès pour la transmission des données de liaison montante ordonnancées, entrée en compétition de la première station pour le premier canal et, une fois la compétition remportée, exécution, par la première station, d'une transmission de données au moyen du premier canal, permettant ainsi une plus grande souplesse d'accès au système et une meilleure utilisation du spectre des fréquences.
PCT/CN2015/070056 2015-01-04 2015-01-04 Procédé de transmission de données et dispositif associé WO2016106776A1 (fr)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102665243A (zh) * 2012-04-01 2012-09-12 东南大学 一种超高速无线局域网中的信道聚合方法
WO2012148061A1 (fr) * 2011-04-29 2012-11-01 Lg Electronics Inc. Appareil et procédé d'accès à un canal en couches dans un système de réseau local sans fil
CN104125046A (zh) * 2013-04-28 2014-10-29 华为技术有限公司 一种数据传输方法、装置及系统
CN104185297A (zh) * 2013-05-21 2014-12-03 华为技术有限公司 一种信道竞争方法及设备

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012148061A1 (fr) * 2011-04-29 2012-11-01 Lg Electronics Inc. Appareil et procédé d'accès à un canal en couches dans un système de réseau local sans fil
CN102665243A (zh) * 2012-04-01 2012-09-12 东南大学 一种超高速无线局域网中的信道聚合方法
CN104125046A (zh) * 2013-04-28 2014-10-29 华为技术有限公司 一种数据传输方法、装置及系统
CN104185297A (zh) * 2013-05-21 2014-12-03 华为技术有限公司 一种信道竞争方法及设备

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