Time Alignment timer value

4G LTE
1

Hello all,
If network does not configure the Time Alignment timer value, then what should be the default value?

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2

Should be Infinity.

3

Is there any spec reference for this?
Because this is need and IE which specify no action.

4

In E///, it is infinity by default.
In Nokia, it was 10240 then infinity was introduced by latest SW releases.

5

Thanks.
Spec does not say anything on the default value.

6

It should be SF10240, (its good that uplink Time alignment tuner should be expire)
By setting this and enabling Timingadvcmdopt switch, you can improve CDR, (i have obtained significant gain on Top CDR cases)

1 Like
7

Hi Experts.

What is value for time alignment timer configured in most of sites? (used for Uplink time alignment)

How UE use it for sync?

How is it different from MAC CE given for timing advance?

8

The Time Alignment Timer is defined as the maximum time UE can be synchronized in uplink even without receiving the Timing Advanced command from gNB/eNB.

Timing Advanced is indicated by base stations that enables UE to adjust its Uplink transmission.