timing advance - enhanced cell id in traces, l12b- acceptance_results

Enhanced cell id in traces, L12B Acceptance

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Lab Acceptance Results: Enhanced Cell Id in Traces | Ericsson Confidential | , Rev |

Test Cases Performed

› FOA-RAN-ECID-101: Feature Activation and Cell Trace Activation

› FOA-RAN-ECI-102: Verify Timing Advance in Cell Trace for stationary UE


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Results for: FOA-RAN-ECI-102TA value of 18 corresponds to distance of 1.41km.

Formula: UE distance = (UE TA value / 2) x (0.52μs / 3.33μs) km

UE receives a value of 31 of the node when there is no change in TA value

eNodeB event shows a TA value of 288

Formula: eNB TA= (UE TA)*16

Timing Advance (TA) is calculated, a C-RNTI is assigned and the UL grant is sent in RA response message since Preamble was validated by eNodeB.

=> RA procedure successful.


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Results for: FOA-RAN-ECI-102TA value of 31 corresponds to distance of 2.42km.






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Results for: FOA-RAN-ECI-102TA value of 44 corresponds to distance of 3.44 km.






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EXTRA SLIDES


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Enhanced cell id in traces, L12B

Reduced resource consumption- Lower O&M bandwidth usage


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Background/Problem descriptionThe amount of PM data that are generated from an eNb has increased in later releases.

The solution presented in L12B is PM data aggregation. Due to the solution selected for sending Timing Advance values in PM event in L12A the, PM data aggregation feature destroyed the TA value.

A new way of handling the TA values in L12B was developed with the intention to follow the PM data volume reduction requirement.


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16Ts = 0,52us

39m

0,30us

16Ts = 0,52us

0,22us

1

39m

2

Perfect UL timing

Background, L12A Feature overview

1. The eNB detects that the UL timing for a UE is more than 0,26us (8TS) from the perfect UL timing. The UL frame is received 0,30us to late.

2. According to the standard eNB orders the UE to send 0,52us earlier this result in 0,22us to early from perfect timing.

3. The UE might move slightly, but as long as it stays within +/-8Ts or +/-0,26us or +/-39m from the perfect timing the eNB will send the TA command 31 to the UE, which corresponds to no change in UE timing.

•Possibility to identify the location of a UE at a certain time using uplink Timing Alignment (TA) value.

•TA value gives an indication of the distance of a UE to an antenna.

•UE Distance = (TA value / 2) (0.52µs/3.33µs) km


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Background, L12A Feature Overview

Sampling periodLatest value = reported value

Sampling Period in L12A = 1.28 seconds

Sampling Period in L12B = 1.0 seconds


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L12A compared to L12BL12A:

Timing Advance values sent every second in a big combined PM event together with other PM data and only the latest TA value is reported.

L12B:

Timing Advance values sent every 60:th second in a separate smaller PM event, only containing the TA value. Each TA PM event contains an array with 60 discrete TA values, one for each second.

The extraction of the TA value within the eNb has not changed between L12A and L12B. It is the transportation method of the TA value in the PM event that has been changed.


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L12B Feature Overview

.

.

Timing Advance value sampled every 1 second internally.

TA1

TA2

TA3

TA60

t

t + 1 sec

t + 2 sec

t + 59 sec TA PM event

sent out from

the eNb every

60:th second

Array with 60 positions


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L12B Feature OverviewNew TA PM Event

INTERNAL_PER_RADIO_UE_MEASUREMENT_TA

EVENT_PARAM_TIMESTAMP_START_HOUR

EVENT_PARAM_TIMESTAMP_START_MINUTE

EVENT_PARAM_TIMESTAMP_START_SECOND

EVENT_PARAM_TIMESTAMP_START_MILLISEC

EVENT_PARAM_TA_INTERVAL

EVENT_ARRAY_TA

Note: If the UE don’t change position, the same TA value as in the previous position is reported. No empty positions in the TA array.


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Benefit of the feature›Reduced O&M bandwidth usage compared to L12A

›Reduced MP CPU consumption for this feature


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Limitations

›Fixed interval length between each TA PM event.

› Value range for the TA value in the PM event is 1 – 20513 not 0 – 20512.


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administration

›None

When the feature is activated, the first PM event will be sent out after 60 seconds. Then a new PM event will be sent out every 60:th second until the feature is deactivated.


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Relation to other features

Related to the L12B feature:

PM Data Aggregation

PM Data Aggregation was introduced to reduce the amount of PM data sent out from an eNb.This feature is also implements with reduced PM data volumes in mind, but still keeping the accuracy of the TA value.

timing advance - enhanced cell id in traces, l12b- acceptance_results

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