Special subframe allocation

摘要

A first base station provides overlapping coverage area with each of a plurality of second base stations. The first base station is of a different base station type than the plurality of second base stations. Each of the plurality of second base stations transmits a message to a plurality of wireless devices in connected mode. The message comprises a subframe allocation bitmap indicating a plurality of subframes. The plurality of subframes comprises a plurality of special subframes. Base stations in the plurality of second base stations configure the same set of subframes as the plurality of special subframes.

主权项

1. A method comprising:
a) providing, by a first base station, an overlapping coverage area with each of a plurality of second base stations, said first base station being of a different base station type than said plurality of second base stations; b) transmitting, by said first base station, a first message to a first plurality of wireless devices in connected mode, said first message comprising:
i) a first subframe allocation repetition period in terms of n frames, wherein n is an integer greater than or equal to one, each frame being assigned a system frame number (SFN);ii) a first subframe allocation offset i, i being an integer greater than or equal to zero; andiii) a first subframe allocation bitmap indicating a first plurality of subframes in k frames, k being an integer where 1≦k≦n, said bitmap applying to subframes in k frames starting from frames whose SFN meets (SFN mod n =i) criterion, said first plurality of subframes comprising a first plurality of special subframes; and c) transmitting, by each of said plurality of second base stations, a second message to a second plurality of wireless devices in connected mode, for each of said plurality of second base stations, said second message comprising said first subframe allocation repetition period, said first subframe allocation offset, and a second subframe allocation bitmap indicating a second plurality of subframes, said second plurality of subframes comprising a second plurality of special subframes; and wherein:
i) base stations in said plurality of second base stations configure the same set of subframes as said second plurality of special subframes;ii) said first plurality of special subframes and said second plurality of special subframes do not substantially overlap in time; andiii) during a majority of symbols of a special subframe of a base station:
(1) no signal being transmitted by said base station; or(2) signals are transmitted at a special subframe power level that is substantially lower than a transmit power during a non-special subframe.