Basic LTE

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Cell Reselection (Equal Priority)

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1. Target

2. TAU Criteria

3. Parameter Explanation

4. Conclusion

Agenda

P.I.Works Stands for Performance Improvement

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Subframe Allignment

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Special Subframe Patern

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LTE category (36.306)

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MIB and SIB Detail

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• Timing Advance Command

A device receives a timing advance command from the network and adjusts uplink transmission timing for PUCCH / PUSCH / SRS

• 36.211 Frame structure

Basic time unit : Ts = 1 / (15000 x 2048) secondsRadio frame duration : Tf = (150 x 2048) x Ts = 307200 x Ts = 10 msNTA = timing offset between uplink and downlink radio frames at the UE, expressed in units of Ts

• 36.321 MAC Timing Advance Command

Distance between a device and the network antenna :A timing advance of one Ts is equivalent to a distance of (3 x 108 x 1 / (15000 x 2048)) / 2 = 4.89 mDistance = propagation speed (light speed) x one Ts delay / 2 (downlink path + uplink path)

• 36.213 Transmission timing adjustments

Initial absolute Random Access Response MAC payload (11 bits) TA range = 0, 1, 2,..., 1282

Random Access Response NTA = TA x 16. Timing adjustment is always positiveExample : TA = 1 then NTA = 1 x 16 Ts. Distance equals 16 x 4.89 m = 78.12 mDistance maximum between a device and the network antenna = 1282 x 78.12 m = 100.156 km (62.23 mi)

Timing Advance

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