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TR 36.828RAN1
E-UTRA – Further enhancements to LTE Time Division Duplex (TDD)
for Downlink-Uplink (DL-UL) Interference Management and Traffic Adaptation

use "3GPP‑Page" to get the Word version
for a better overview, the Table of Contents (ToC) is reproduced
V11.0.0 (Wzip)  2012/06  109 p.

Rapporteur:  group chairman

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.

full Table of Contents for  TR 36.828  Word version:   11.0.0

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1  ScopeWord-p. 6
2  References
3  Definitions, symbols and abbreviations
4  Objectives of studyWord-p. 7
5  Feasibility study
6  Performance evaluationWord-p. 42
7  Methods to support different time scales for TDD UL-DL reconfigurationWord-p. 99
8  Potential interference mitigation schemes
9  Conclusion and recommendationsUp
A  Co-existence simulation assumptionsWord-p. 105
B  Change historyWord-p. 109

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