9.2.54 ABS Information
36.4233GPPEvolved Universal Terrestrial Radio Access Network (E-UTRAN)Release 17TSX2 Application Protocol (X2AP)
This IE provides information about which sub frames the sending eNB is configuring as almost blank subframes and which subset of almost blank subframes are recommended for configuring measurements towards the UE. Almost blank subframes are subframes with reduced power on some physical channels and/or reduced activity.
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IE/Group Name |
Presence |
Range |
IE type and reference |
Semantics description |
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CHOICE ABS Information |
M |
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>FDD |
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>>ABS Pattern Info |
M |
BIT STRING (SIZE(40)) |
Each position in the bitmap represents a DL subframe, for which value "1" indicates ‘ABS’ and value "0" indicates ’non ABS’. The first position of the ABS pattern corresponds to subframe 0 in a radio frame where SFN = 0. The ABS pattern is continuously repeated in all radio frames. The maximum number of subframes is 40. |
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>>Number Of Cell-specific Antenna Ports |
M |
ENUMERATED (1, 2, 4, …) |
P (number of antenna ports for cell-specific reference signals) defined in TS 36.211 [10] |
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>>Measurement Subset |
M |
BIT STRING (SIZE(40)) |
Indicates a subset of the ABS Pattern Info above, and is used to configure specific measurements towards the UE. |
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>TDD |
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>>ABS Pattern Info |
M |
BIT STRING (1..70, …) |
Each position in the bitmap represents a subframe. Value "1" indicates ‘ABS’ and value "0" indicates ’non ABS’ which is applicable only in positions corresponding to the DL direction. The maximum number of subframes depends on UL/DL subframe configuration. The maximum number of subframes is 20 for UL/DL subframe configuration 1~5; 60 for UL/DL subframe configuration 6; 70 for UL/DL subframe configuration 0. UL/DL subframe configuration defined in TS 36.211 [10]. The first position of the ABS pattern corresponds to subframe 0 in a radio frame where SFN = 0. The ABS pattern is continuously repeated in all radio frames, and restarted each time SFN = 0. |
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>>Number Of Cell-specific Antenna Ports |
M |
ENUMERATED (1, 2, 4, …) |
P (number of antenna ports for cell-specific reference signals) defined in TS 36.211 [10] |
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>>Measurement Subset |
M |
BIT STRING (1..70, …) |
Indicates a subset of the ABS Pattern Info above, and is used to configure specific measurements towards the UE |
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>ABS Inactive |
M |
NULL |
Indicates that interference coordination by means of almost blank sub frames is not active |