Ieee p802. 21m Media Independent Services Framework Project


Deriving generic IEEE 802.21 QoS parameters



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Deriving generic IEEE 802.21 QoS parameters

General


The following subclauses describe how to derive generic QoS parameters from IEEE Std 802.11 link measurement parameters. This derivation relies on incremental values of counters as specified in the IEEE Std 802.11.

Note that the parameters are unicast parameters that are unrelated to multicast traffic.


Packet loss rate


To calculate the packet loss rate (PLR), one uses Equation (1).

(1)

According to IEEE Std 802.11, a packet is a MAC user data packet or MAC service data unit (MSDU).

The PLRMSDU can be derived from the Transmit Stream/Category Measurement Report using Equation (2).

(2)

=

Packet error rate


The packet error rate (PER) can be calculated using Equation (3).

(3)

Unlike for PLR, this parameter is only defined for the IEEE 802.11 MPDU. The PER can be derived from the STA Statistics Report information element using Equation (4).



(4)

Average transfer delay


In IEEE Std 802.11k, the transmit delay (MSDU delay) is defined as follows:

Transmit delay (MSDU delay): The delay shall be measured from the time the MSDU is passed to the MAC sublayer until the point at which the entire MSDU has been successfully transmitted including receipt of the final ACK.

If the average MSDU transmit delay is used for the IEEE 802.21 average transfer delay, it can be derived from Transmit Stream/Category Measurement Report.


Packet transfer delay jitter


Using the IEEE 802.21 definition of “the standard deviation of the delay over a population of interest,” the IEEE 802.11 MAC sublayer provides the Transmit Stream/Category Measurement Report and measurement parameters to calculate the standard deviation of delay.

QoS Metric information element includes:



  1. Transmit Delay Histogram

Average Transmit Delay parameters

Variance calculation using discrete density function is given as



Therefore, the packet transfer delay jitter for MSDU level is



where,


N = the number of bins of Transmit Delay Histogram

Pi= the value (measured percentile) of ith bin of Transmit Delay Histogram

xi = the mean value of the delay range of ith bin

(to be excluded)
(informative)
Handover procedures





(normative)
Mapping MIS messages to reference points


Table D. 1 maps the MIS messages to the MIS communication model reference points.

Table D.—Mapping MIS messages to reference points

MIS message name

Reference point

MIS_Capability_Discover

RP1, RP2, RP3, RP4, RP5

MIS_Event_Subscribe

RP1, RP3

MIS_Event_Unsubscribe

RP1, RP3

MIS_Register

RP1, RP3, RP5

MIS_DeRegister

RP1, RP3, RP5







MIS_Link_Detected

RP1, RP3

MIS_Link_Up

RP1, RP3, RP5

MIS_Link_Down

RP1, RP3, RP5

MIS_Link_Parameters_Report

RP1, RP3, RP5

MIS_Link_Going_Down

RP1, RP3, RP2

MIS_Link_Handover_Imminent

RP1, RP3, RP2

MIS_Link_Handover_Complete

RP1, RP3







MIS_Link_Get_Parameters

RP1, RP3, RP2

MIS_Link_Configure_Thresholds

RP1, RP3

MIS_Link_Actions

RP1, RP3

MIS_Net_HO_Candidate_Query

RP1, RP3

MIS_MN_HO_Candidate_Query

RP1, RP3

MIS_N2N_HO_Query_Resources

RP5

MIS_MN_HO_Commit

RP1, RP3


Table D.1—Mapping MIS messages to reference points (continued)

MIS message name

Reference point

MIS_Net_HO_Commit

RP1, RP3

MIS_N2N_HO_Commit

RP5

MIS_MN_HO_Complete

RP1, RP2, RP3

MIS_N2N_HO_Complete

RP5

MIS_Get_Information

RP1, RP2, RP3, RP4, RP5

MIS_Push_Information

RP1, RP2, RP3, RP4, RP5

MIS_Auth

RP1, RP3

MIS_Termination_Auth

RP1, RP3

MIS_Push_Key

RP1, RP3




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