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Abstract
Relaying is one of the proposed technologies for LTE-Advanced networks. In order to enable a flexible and reliable relaying support, the currently adopted architectural structure of LTE networks has to be modified. In this paper, we extend the LTE architecture to enable dynamic relaying, while maintaining backward compatibility with LTE Release 8 user equipments, and without limiting the flexibility and reliability expected from relaying. With dynamic relaying, relays can be associated with base stations on a need basis rather than in a fixed manner which is based only on initial radio planning. Proposals are also given on how to further improve a relay enhanced LTE network by enabling multiple interfaces between the relay nodes and their controlling base stations, which can possibly be based on technologies different from LTE, so that load balancing can be realized. This load balancing can be either between different base stations or even between different networks.
Highlights
The use of radio relaying with the deployment of relay nodes (RNs) for coverage extension in cellular networks is not a new concept [1]
In the architecture described so far, the RNs are assumed to be deployed by the operator on certain locations, especially on hotspots and locations that are highly likely to suffer from coverage loss, and each RN is associated with a donor enhanced Node B (eNB)
The deactivation command from the donor eNB to the RN can contain parameters needed for future reactivation of the RN. This can include timer values such as a sleep interval during which the RN completely shuts down its transceiver, and on-duration periods during which the RN will listen on a common control channel such as a paging channel to determine if the donor eNB is trying to reactivate it
Summary
The use of radio relaying with the deployment of relay nodes (RNs) for coverage extension in cellular networks is not a new concept [1]. Due to the assumption of focusing this paper on LTE-Advanced we refer to a base station by the 3GPP term enhanced Node B (eNB). A conventional relaying scheme is assumed in this paper to support backwards compatibility as it is simple and practical for transitioning LTE into the realm of multihop systems. The aim of this paper is to present an architecture that will enable dynamic relay deployment in LTE networks in a backward compatible way from the UE’s point of view. After discussing distributed relaying where a relay node can be served via several eNBs in Section 6, a conclusion is given
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