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TR 36.828 (RAN1)
E-UTRA – Further enhancements to LTE Time Division Duplex (TDD) for Downlink-Uplink (DL-UL) interference management and traffic adaptation

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V11.0.0 (Wzip)    2012/06    109 p.

Rapporteur:  group chairman
See also:  –

TDD offers flexible deployments without requiring a pair of spectrum resources. For TDD deployments in general, interference between UL and DL including both basestation-to-basestation and UE-to-UE interference needs to be considered. One example includes layered heterogeneous network deployments, where it may be of interest to consider different uplink-downlink configurations in different cells.

Also of interest are deployments involving different carriers deployed by different operators in the same band and employing either the same or different uplink-downlink configurations, where possible interference may include adjacent channel interference as well as co-channel interference such as remote basestation-to-basestation interference.

Currently, LTE TDD allows for asymmetric UL-DL allocations by providing seven different semi-statically configured uplink-downlink configurations. These allocations can provide between 40% and 90% DL subframes. The semi-static allocation may or may not match the instantaneous traffic situation. The current mechanism for adapting UL-DL allocation is based on the system information change procedure. Additional mechanisms could include e.g. dynamic allocation of subframes to UL or DL.


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1   Scope   Word-p. 6
2   References
3   Definitions, symbols and abbreviations
4   Objectives of study   Word-p. 7
5   Feasibility study
6   Performance evaluation   Word-p. 42
7   Methods to support different time scales for TDD UL-DL reconfiguration   Word-p. 99
8   Potential interference mitigation schemes
9   Conclusion and recommendations      Up
A   Co-existence simulation assumptions   Word-p. 105
B   Change history   Word-p. 109

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