extended BSS load spatial/frequency element further provides underutilization to solve the the spatial stream load unbalancing underutilization given the problem in 802.11ax busy channel such that unassociated STA with MU-MIMO capability can TGax editor makes choose the proper AP. changes as shown in the Now 11ax introduce as specified in OFDMA, there is the probability of frequence underutilization given the busy channel. Discussion: … Load balancing problem were considered 802.11-2016[1] includes Channel utilization in time domain was proposed in 9.4.2.28 BSS Load element Spatial stream underutilization in space domain was proposed in 9.4.2.160 Extended BSS Load element STAs use it for implementation-specific AP selection, in to obtain more transmission opportunities. 802.11ax introduced and MU-MIMO two key features where partial bandwidth MU-MIMO is allowed which is different from the downlink full bandwidth MU-MIMO in 802.11ac, but these two key features are not reflected in traffic load for HE BSSs Frequency underutilization regarding and spatial stream underutilization regarding (including both full bandwidth MU-MIMO and partial bandwidth MU-MIMO) were first present in [2] and [3] The concept of frequency and spatial stream underutilization for OFDMA/MU-MIMO was agreed in 2017 Korea IEEE MAY F2F meeting [4]. We discusse frequency underutilization and spatial stream underutilization three aspects, including OFDMA only transmission, partial bandwidth MU-MIMO transmission and full bandwidth MU-MIMO transmission. We assume that the maximum supported streams on AP side is 8 and the bandiwth is 20 MHz in the following discussion. 1. Regarding OFDMA only transmission, each RU will be selected to assign to some STA according to frequency selective. However, in some case, some RU is not assigned because that this RU is deep fading for the scheduled STA which have traffic or non-contiguous RUs are not allowed to assigned to one STA as shown in the following figure. According to the following figure, AP has underutilized frequency domain resource (52 tone RU is available) for given busy time of the medium which is not reflected in BSS Load element and extended BSS Load element.
extended BSS load element further provides the the spatial stream underutilization given the busy channel such that unassociated STA with MU-MIMO capability can choose the proper AP. Now 11ax introduce OFDMA, there is the probability of frequence underutilization given the busy channel. spatial/frequency underutilization to solve load unbalancing problem in 802.11ax TGax editor makes changes as shown in the as specified in Discussion: … Load balancing problem were considered 802.11-2016[1] includes Channel utilization in time domain was proposed in 9.4.2.28 BSS Load element Spatial stream underutilization in space domain was proposed in 9.4.2.160 Extended BSS Load element STAs use it for implementation-specific AP selection, in to obtain more transmission opportunities. 802.11ax introduced and MU-MIMO two key features where partial bandwidth MU-MIMO is allowed which is different from the downlink full bandwidth MU-MIMO in 802.11ac, but these two key features are not reflected in traffic load for HE BSSs Frequency underutilization regarding and spatial stream underutilization regarding (including both full bandwidth MU-MIMO and partial bandwidth MU-MIMO) were first present in [2] and [3] The concept of frequency and spatial stream underutilization for OFDMA/MU-MIMO was agreed in 2017 Korea IEEE MAY F2F meeting [4]. We discusse frequency underutilization and spatial stream underutilization three aspects, including OFDMA only transmission, partial bandwidth MU-MIMO transmission and full bandwidth MU-MIMO transmission. We assume that the maximum supported streams on AP side is 8 and the bandiwth is 20 MHz in the following discussion. 1. Regarding OFDMA only transmission, each RU will be selected to assign to some STA according to frequency selective. However, in some case, some RU is not assigned because that this RU is deep fading for the scheduled STA which have traffic or non-contiguous RUs are not allowed to assigned to one STA as shown in the following figure. According to the following figure, AP has underutilized frequency domain resource (52 tone RU is available) for given busy time of the medium which is not reflected in BSS Load element and extended BSS Load element.
11-18-0181-01-00ax-lb230-cr-on-bss-load-information-in-subclause-9-4-2.docx