3gpp干扰减少R1-00833_DL interference mitigation3gpp干扰减少R1-050833_DL interference mitigation.doc

3GPP TSG RAN WG1 #42 R1-050833 London, England August, 29 – September, 2, 2005 __________________________________________________________________________ Agenda item: 10.2.1 Source: LG Electronics Title: Interference mitigation in evolved UTRA/UTRAN Document for: Discussion __________________________________________________________________________ 1. Introduction For the evolved UTRA/UTRAN, there were discussions on the inter-cell interference mitigation especially using an active coordination in the frequency domain resource allocation between neighbour cells [1][2][3]. In this paper, we discuss the general aspects of the interference mitigation methods using frequency domain coordination and suggest a practical way of the interference mitigation. 2. Frequency domain coordination 2.1 Segmentation of the total bandwidth into sub-bands ? Frequency domain coordination is preferable As already discussed in last meetings, interference between neighbour cells in OFDMA downlink can be reduced by coordinating resource allocation between neighbour cells so that the main interference power between neighbour cells are not overlapped into the same time-frequency resource. Especially, as long as the timing synchronization between neighbour cells is not guaranteed, frequency domain coordination is most preferable way. ? Semi-static frequency domain coordination by predefined multiple sub-bands It would require too much signaling burden for the neighbour cells to coordinate resource allocation dynamically, e.g., every TTI. Therefore, a semi-static coordination by network is a preferable way. For this purposes, a total bandwidth can be segmented into multiple sub-bands, where neighbour cells may use the different sub-bands for the main interference sources in each cell. The number of sub-bands can be as small as 3 when considering 3-sector cell layout as shown in Figure 1, or may be larger than 3 i