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TR 36.866RAN1
Study on Network-Assisted Interference
Cancellation and Suppression (NAIC) for LTE

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V12.0.1 (Wzip)  2014/03  64 p.

Rapporteur:  Dr. Zhuang, Jeff

To boost capacity in coping with the exponential traffic growth, both denser cell deployment and improved cell spectral efficiency are required. Co-channel interference, either from inter-cell or co-scheduled intra-cell users, is expected to become the dominant limiting factor for achieving higher network capacity.
Historically much effort has been spent on transmission coordination to mitigate inter-user and inter-cell interference, for example via enhanced CSI feedback. However, one of the Rel-11 studies (Advanced Receivers) showed promising performance gain from practical linear interference suppression (IS) receivers that do not require any transmission coordination. Specifying interference rejection combining (IRC) receiver UE performance requirements in RAN4 is just a first step towards increasing the receiver role in the system design. In another Rel-11 work item (feICIC), non-linear interference cancellation receivers that mitigate strong CRS/PSS/SSS/PBCH interference have been shown to provide significant gain over linear receivers.
Further enhancements to intra-cell and inter-cell interference mitigation at the receiver side could be achieved by increasing the degree of knowledge about interfering transmissions with possible coordination in the network. For example, linear IS receivers and iterative/non-iterative explicit IC receivers could be evaluated with participating transmitters coordinating and providing side knowledge of the interference such as, but not limited to, the presence and characteristics of interference, its transmission schemes including resource allocation, its reference symbols for possibly enabling channel estimation, and its modulation format and/or coding rate.
Compared to transmission-side techniques whose performance degrades under imperfect channel knowledge at the transmitter side due to limited feedback, IS/IC receivers can alleviate the burden of channel feedback.
Network-assisted IS/IC might require standardization effort, especially on the signalling aspects that can enable more effective and robust UE-side interference cancellation and/or suppression with possible network coordination, as well as on the physical layer changes that can translate link-level improvement of these advanced receivers to system-level capacity gain. It is also important to study the trade-off, in terms of performance, complexity, and signalling overhead, when enabling feasible and robust interference cancellation/suppression at the UE side with and without network assistance.

full Table of Contents for  TR 36.866  Word version:   12.0.1

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1  ScopeWord-p. 6
2  References
3  Definitions, symbols and abbreviationsWord-p. 7
4  Introduction
5  Study objectivesWord-p. 8
6  Scenarios and targeted/interference channelsWord-p. 9
7  Receiver structures and assumptions
8  Link-level performance evaluationWord-p. 14
9  System-level performance evaluation
10  Potential specification impactWord-p. 60
11  Conclusions
A  Evaluation assumptionsWord-p. 62
B  Change historyWord-p. 64

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