CN-122028209-A - Communication apparatus and communication method

CN122028209ACN 122028209 ACN122028209 ACN 122028209ACN-122028209-A

Abstract

The invention provides a communication device and a communication method. In an 802.11ax network with an access point, a trigger frame supplies scheduled and random resource units to a node for data uplink communication to the access point. To use the network more efficiently, the access point may design a trigger frame to force the node to send certain categories of data. Resource units may be defined in the trigger frame to be dedicated to a packet or some access class data. Adjusting the length of time of the resource units helps limit the types of data that these resource units can transmit. In addition, using different bandwidths for resource elements in the same trigger frame may help reduce padding in the resource elements in the case where different traffic types coexist.

Inventors

S. Barron
R. Virgil
P. Waig
Left inside P.

Assignees

佳能株式会社

Dates

Publication Date: 20260512
Application Date: 20160708
Priority Date: 20150710

Claims (14)

1. A communication device, comprising: A transmission section for transmitting a trigger frame conforming to an institute of Electrical and electronics Engineers, IEEE 802.11 standard and including classification information for classifying one or more communication channels in a frequency domain into a plurality of resource units to be simultaneously transmitted on the plurality of resource units, wherein the classification information includes information that the resource units are associated with each other with an association identifier, AID, of other communication devices using the resource units, and Receiving means for receiving data from a plurality of other communication devices using the plurality of resource units, Wherein in the case where specific information is stored in the trigger frame as the classification information, the specific information indicates that a size of a resource unit to be used for communication by a communication device identified based on an AID of the communication device among the plurality of other communication devices is a size that allows transmission of a predetermined amount of data in data transmission of a second TXOP duration obtained by dividing the first TXOP duration by about 3 in the case where the predetermined amount of data is transmitted using 26-tone resources.
2. The communication device of claim 1, wherein the trigger frame further comprises, for each of the plurality of other communication devices, information representative of an access category that classifies data.
3. The communication device of claim 2, wherein the access class is one of four access classes defined in the IEEE 802.11 standard, namely one of ac_bk for background data, ac_be for best effort data, ac_vi for video applications, and ac_vo for voice applications.
4. The communication device of claim 1, wherein the trigger frame reserves the one or more communication channels.
5. The communication device of claim 1, further comprising: And the determining component is used for determining the transmission frequency of the trigger frame based on the statistical data of the wireless network to which the communication device belongs.
6. The communication device of claim 1, further comprising: A determining unit configured to determine, based on statistics of a wireless network to which the communication device belongs, a number of resource units and a size of the plurality of resource units for resource units to be allocated as the plurality of resource units by the trigger frame.
7. The communication device of claim 1, wherein the communication device is an access point.
8. A communication device, comprising: A receiving means for receiving, from another communication device, a trigger frame conforming to an institute of electrical and electronics engineers, IEEE, 802.11 standard and including classification information for classifying one or more communication channels in a frequency domain into a plurality of resource units for simultaneous transmission on the plurality of resource units, and A transmission means for transmitting data using at least one of the plurality of resource units after receiving the trigger frame, Wherein, in the case where specific information is stored in the trigger frame as the classification information, the specific information indicates that a size of a resource unit to be used for communication by a communication device of a plurality of communication devices that perform simultaneous transmission is a specific size that allows transmission of a predetermined amount of data in data transmission of a second TXOP duration obtained by dividing a first TXOP duration by about 3 in the case where the predetermined amount of data is transmitted using 26-tone resources, and Wherein, in the case where the size of the resource unit to be used for communication by the communication device identified based on the classification information and the AID of the communication device is a specific size, the transmission means transmits data to the other communication device using the resource unit of the specific size.
9. The communication device of claim 8, wherein the trigger frame further comprises, for each of the plurality of resource units, information representative of an access category that classifies data.
10. The communication device of claim 9, wherein the access class is one of four access classes defined in the IEEE 802.11 standard, namely one of ac_bk for background data, ac_be for best effort data, ac_vi for video applications, and ac_vo for voice applications.
11. The communication device of claim 8, wherein the trigger frame reserves the one or more communication channels.
12. The communication device of claim 8, wherein the other communication device is an access point.
13. A communication method in a communication device, comprising the steps of: Transmitting a trigger frame conforming to an institute of electrical and electronics engineers, IEEE, 802.11 standard and including classification information for classifying one or more communication channels in a frequency domain into a plurality of resource units to be simultaneously transmitted on the plurality of resource units, wherein the classification information includes information that the resource units are associated with each other with association identifiers, AIDs, of other communication devices using the resource units, and Receive data from a plurality of other communication devices using the plurality of resource units, Wherein in the case where specific information is stored in the trigger frame as the classification information, the specific information indicates that a size of a resource unit to be used for communication by a communication device identified based on an AID of the communication device among the plurality of other communication devices is a size that allows transmission of a predetermined amount of data in data transmission of a second TXOP duration obtained by dividing the first TXOP duration by about 3 in the case where the predetermined amount of data is transmitted using 26-tone resources.
14. A communication method in a communication device, comprising the steps of: receiving a trigger frame from another communication device conforming to the institute of Electrical and electronics Engineers, IEEE 802.11, standard and including classification information for classifying one or more communication channels in a frequency domain into a plurality of resource units for simultaneous transmission thereon, and Transmitting data using at least one of the plurality of resource units after receiving the trigger frame, Wherein, in the case where specific information is stored in the trigger frame as the classification information, the specific information indicates that a size of a resource unit to be used for communication by a communication device of a plurality of communication devices that perform simultaneous transmission is a specific size that allows transmission of a predetermined amount of data in data transmission of a second TXOP duration obtained by dividing a first TXOP duration by about 3 in the case where the predetermined amount of data is transmitted using 26-tone resources, and Wherein, in case the size of the resource unit to be used for communication by the communication device identified based on the classification information and the AID of the communication device is a specific size, the step of transmitting transmits data to the other communication device using the resource unit of the specific size.

Description

Communication apparatus and communication method (The present application is a divisional application of application having a filing date of 2016, 7, 8, 202111191758.4, and entitled "communication device, communication method, and computer-readable medium") Technical Field The present invention relates generally to wireless communication networks and, more particularly, to random allocation for uplink communications, such as OFDMA subchannels (or resource units) forming a communication composite channel. One application of the method involves wireless data communication over a wireless communication network using carrier sense multiple access/collision avoidance (CSMA/CA), where the network is accessible by a plurality of node devices. Background The IEEE802.11 MAC standard defines the manner in which a Wireless Local Area Network (WLAN) must operate at the physical level and at the Medium Access Control (MAC) level. In general, the 802.11 MAC (medium access control) mode of operation implements a well-known Distributed Coordination Function (DCF) which relies on a contention-based mechanism based on the so-called "carrier sense multiple access/collision avoidance" (CSMA/CA) technology. The 802.11 medium access protocol standard or mode of operation is primarily concerned with managing communication nodes that wait for a wireless medium to become idle in an attempt to access the wireless medium. The network operating mode defined by the IEEE 802.11ac standard provides Very High Throughput (VHT) by moving from the 2.4GHz band, which is considered to be extremely susceptible to interference, to the 5GHz band, etc., thereby enabling the use of wider 80MHz frequency continuous channels, two of which may be optionally combined to obtain a 160MHz channel as the operating band of the wireless network. The 802.11ac standard also adjusts control frames such as Request-To-Send (RTS) frames and Clear-To-Send (CTS) frames To allow composite channels with different predefined bandwidths of 20MHz, 40MHz or 80MHz, where the composite channels are made up of one or more channels that are contiguous within the operating band. The 160MHz composite channel may be a combination of two 80MHz composite channels within the 160MHz operating band. The control frame specifies the channel width (bandwidth) of the target composite channel. Thus, the composite channel contains a primary channel for which a given node performs an EDCA backoff procedure to access the medium, and at least one secondary channel, e.g., 20 MHz. The communication node uses the primary channel to listen for whether the channel is idle and may use the secondary channel to extend the primary channel to form a composite channel. The listening to channel clear is performed using CCA (clear channel assessment), more particularly using CCA-ED (acronym for CCA-ENERGY DETECT (energy detection)). CCA-ED is the ability of any node to detect non-802.11 energy in a channel and back off data transmissions. The ED threshold, upon which the detected energy on the channel is compared, is defined as, for example, 20dB higher than the minimum sensitivity of the PHY layer of the node. If the in-band signal energy exceeds the threshold, the CCA remains busy until the medium energy is again below the threshold. In view of the tree decomposition of the operating band into the basic 20MHz channel, some secondary channels are named tertiary or quaternary channels. In 802.11ac, all of the transmission thus possible composite channels include the primary channel. This is because the node performs complete carrier sense multiple access/collision avoidance (CSMA/CA) and Network Allocation Vector (NAV) tracking only on the primary channel. Other channels are assigned as secondary channels on which a node has the capability of CCA (clear channel assessment) only, i.e. the capability of detecting a clear or busy state/condition of the secondary channel. A problem with the use of composite channels defined in either 802.11n or 802.11ac (or 802.11 ax) is that 802.11n and 802.11ac compatible nodes (i.e., HT nodes (High Throughput node (acronym for high throughput nodes)) and other legacy nodes (i.e., non-HT nodes that are compatible only with, for example, 802.11 a/b/g) must coexist in the same wireless network and therefore must share a20 MHz channel. To address this problem, the 802.11n and 802.11ac standards provide the ability to replicate control frames (e.g., RTS/CTS frames or CTS-to-Self frames or ACK frames to confirm correct or incorrect reception of transmitted data) in an 802.11a legacy format (referred to as "non-HT") to establish protection for the requested TXOP over the entire composite channel. This is for any legacy 802.11a node that uses any 20MHz channel contained in the composite channel to learn about the ongoing communications on the 20MHz channel being used. As a result, legacy nodes are prevented from initiating new transmissions until the end of the current composite c