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首页Soft Frequency Reuse Scheme for UTRAN LTE
The objective of UTRA evolution study item is to develop a framework for the evolution of the 3GPP radio-access technology towards a high-data-rate, low-latency and packet-optimized radio-access technology [1]. The new requirements on higher spectrum efficiency and increased data rate at the cell edge, along with consideration of alternative transmission technologies such as OFDM, open the question of the frequency reuse factor in EUTRA. In this contribution we show some benefits of the so-called soft reuse scheme for the application in the EUTRA along with multi-carrier based transmission technologies, such as OFDM for example.
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3GPP TSG RAN WG1 Meeting #41 R1-050507
Athens, Greece, 9 – 13 May, 2005
Agenda Item: 13.2
Source: Huawei
Title: Soft Frequency Reuse Scheme for UTRAN LTE
Document for: Discussion
1 Introduction
The objective of UTRA evolution study item is to develop a framework for the evolution of the 3GPP radio-access
technology towards a high-data-rate, low-latency and packet-optimized radio-access technology [1]. The new
requirements on higher spectrum efficiency and increased data rate at the cell edge, along with consideration of
alternative transmission technologies such as OFDM, open the question of the frequency reuse factor in EUTRA.
In this contribution we show some benefits of the so-called soft reuse scheme for the application in the EUTRA along
with multi-carrier based transmission technologies, such as OFDM for example. The optimum reuse factor at the cell
edge is analysed in Section 2. The soft frequency reuse scheme, which is characterised by frequency reuse factor 1 in
the central region of a cell, and by frequency reuse factor greater than 1 at the outward cell region close to the cell edge,
is defined in details in the Section 3. The benefits of soft reuse scheme are pointed out in section 4. Finally, some
conclusions are given in Section 5.
2 Frequency Reuse Factor Analysis
In a multi-carrier telecommunication system, the frequency reuse can be achieved in 2 ways:
1. Carrier method: different carriers in different cell, same to traditional frequency reuse method.
2. Sub-carrier method: same carrier and different sub-carriers in different cell which illustrated in Fig. 1.
In a wireless cellular communication system, the signal to interference ratio (SIR) can be generally described as:
(1)
: the received power of the expected user signal
: inner cell interference power
: other cell interference power
: white noise power
We assume that advanced MA scheme or receiver is used, the intra-cell interference is eliminated, and the SIR
representation can be simplified as:
. (2)
In case of flat fading channel, according to the Shannon’s theorem, the channel capacity is given as:
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