53 lines
2.1 KiB
Plaintext
53 lines
2.1 KiB
Plaintext
# To balance congestion, use the remaining free percentage instead of free lchan counts.
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#
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# Cell A has min-free-slots 2, and has all slots occupied.
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# Cell B has min-free-slots 4, and has 2 slots remaining free.
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#
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# If we count congested lchans: cell A has a congestion count of 2: two more lchans in use than "allowed".
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# If we move one lchan over to cell B, it ends up with a congestion count of 3, which is worse than 2.
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# So when counting lchans, we decide that cell A should remain full.
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#
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# Instead, when comparing percentage of remaining lchans, we would see that cell A is loaded 100% above congestion (2 of
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# 2 remaining lchans in use), but when moving one lchan to cell B, it would only be 75% loaded above its treshold (3 of
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# 4 remaining lchans in use). So a percentage comparison would cause a handover to cell B.
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#
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# This test currently expects the behavior of counting lchans; a patch will change to use percentage, which should
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# reflect in this test.
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create-bts trx-count 1 timeslots c+s4 TCH/F TCH/F TCH/F TCH/F TCH/F TCH/F PDCH
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create-bts trx-count 1 timeslots c+s4 TCH/F TCH/F TCH/F TCH/F TCH/F TCH/F PDCH
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network
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bts 0
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handover2 min-free-slots tch/f 2
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bts 1
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handover2 min-free-slots tch/f 4
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set-ts-use trx 0 0 states * TCH/F TCH/F TCH/F TCH/F TCH/F TCH/F *
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set-ts-use trx 1 0 states * TCH/F TCH/F TCH/F TCH/F - - *
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meas-rep lchan * * * * rxlev 40 rxqual 0 ta 0 neighbors 30
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expect-no-chan
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# bts 0 is full, by target_overbooked_after_ho==75% < current_overbooked_before_ho==100%, a congestion balancing to bts
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# 1 is performed.
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congestion-check
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expect-ho from lchan 0 0 1 0 to lchan 1 0 5 0
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# Make sure that no percentage based handover merely reverses the situation between two cells:
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network
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bts 0
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handover2 min-free-slots tch/f 4
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bts 1
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handover2 min-free-slots tch/f 4
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set-ts-use trx 0 0 states * TCH/F TCH/F TCH/F TCH/F - - *
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set-ts-use trx 1 0 states * TCH/F TCH/F TCH/F - - - *
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# the condition is false: target_overbooked_after_ho==50% < current_overbooked_before_ho==50%, so no congestion
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# balancing is performed.
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congestion-check
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expect-no-chan
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