Transmit stream/category measurement

Transmit stream/category measurement

The Transmit Stream/Category measurement is a request/report pair that enables a QoS STA to inquire of a
peer QoS STA the condition of an ongoing traffic stream between them. The Transmit Stream/Category
Measurement Report provides the transmit-side performance metrics for the measured traffic stream.
Trigger conditions included in the Transmit Stream/Category Measurement Request may initiate triggered
Transmit Stream/Category Measurement Reports upon detection of the trigger condition.
 Operation in licensed frequency bands
General
IEEE 802.11 devices can operate on frequencies that are licensed by national regulatory bodies. Although
this standard has been generalized so that it is independent of license type, band, and country of operation,
only the bands and associated regulations listed in Annex D have been specifically considered.
Dynamic STA enablement (DSE) in licensed bands
The DSE operating procedures are used to automate the channel provisioning and regulatory controls
needed for unregistered IEEE 802.11 STAs to operate as dependent STAs in licensed spectrum.17
 Contention-Based Protocol (CBP) in nonexclusively licensed bands
The granting of licenses on a nonexclusive, uncoordinated basis in the same area leads to the possibility of
overlapping networks. When overlapping networks cause co-channel interference, regulations, such as those
governing the 3650 MHz band in the United States, require the use of a CBP “by which a transmitter
provides reasonable opportunities for other transmitters to operate.”18 IEEE 802.11 carrier sense multiple
access with collision avoidance (CSMA/CA) is suitable for this purpose in most situations.
Using DSE STA identification to resolve interference
When CSMA/CA is not able to sufficiently sense the presence of another licensee’s STA (i.e., a hidden
STA) or if a secondary licensee causes inference to a primary licensee, the licensee is obliged to resolve
complaints that result from interference caused by any STA under its control (including dependent STAs).
In order to facilitate the interference resolution processes, all STAs operating in nonexclusively licensed
spectrum use the DSE STA and location information procedures.
The STA identification and location information procedures are inherently tied because, by default,
registered STAs broadcast their actual location as their unique identifier. Dependent STAs broadcast the
location of the STA that has enabled them as well as a unique code selected by the licensee. This method
puts a victim of the interference in contact with the party responsible for rectifying the problem, and, at the
same time, it protects the privacy of the dependent STA’s operator


Further coexistence enhancements in nonexclusively licensed bands
While not explicitly required to meet specific rules, a number of optional IEEE 802.11 mechanisms, when
used together, are able to meet general requirements for spectrum sharing, incumbent detection, and other
cognitive radio functions in licensed bands. The specific mechanisms for each band are detailed in E.2.
17In some licensed frequency bands, wireless equipment can be owned and operated by individuals who do not hold a license. In such
instances, devices are permitted to operate only if they are either communicating with, or receiving permission to transmit from, a STA
that is maintained by a licensed operator. The Japanese 4.9 GHz band and the U.S. 4.94–4.99 GHz public safety band are examples in
which IEEE 802.11 STAs operate under such arrangements.
18Definition of CBP from FCC 05-56, Report and Order and Memorandum Opinion and Order, clause 58.