Softer and soft handoff in an orthogonal frequency division wireless communication system
First Claim
Patent Images
1. A wireless communication apparatus, comprising:
- a plurality of antenna groups, each antenna group corresponding to a sector of a cell;
a memory that stores a plurality of pilot pattern indicators each corresponding to a group of a plurality of pilot symbols and corresponding to one or more of the plurality of antenna groups; and
a circuit coupled with the plurality of antenna groups that determines whether a wireless communication device is in handoff, and selects a pilot pattern indicator of the plurality of pilot pattern indicators to be transmitted to a the wireless communication device based upon whether the wireless communication device is in the handoff, wherein the selected pilot pattern indicator is indicative of the wireless communication device being in the handoff; and
wherein a same pilot pattern indicator is transmitted to different wireless communication devices in the handoff at a boundary of adjacent sectors of the cell.
1 Assignment
0 Petitions
Accused Products
Abstract
Transmission patterns for pilot symbols transmitted from a mobile station or base station are provided. The patterns may be selected according to a location of the mobile station with respect to one or more antennas are provided. In some aspects, the pattern may be selected based upon the distance between the mobile station and the one or more antennas. In other aspect, the pattern may be based upon whether the mobile station is in handoff.
29 Citations
19 Claims
-
1. A wireless communication apparatus, comprising:
-
a plurality of antenna groups, each antenna group corresponding to a sector of a cell; a memory that stores a plurality of pilot pattern indicators each corresponding to a group of a plurality of pilot symbols and corresponding to one or more of the plurality of antenna groups; and a circuit coupled with the plurality of antenna groups that determines whether a wireless communication device is in handoff, and selects a pilot pattern indicator of the plurality of pilot pattern indicators to be transmitted to a the wireless communication device based upon whether the wireless communication device is in the handoff, wherein the selected pilot pattern indicator is indicative of the wireless communication device being in the handoff; and wherein a same pilot pattern indicator is transmitted to different wireless communication devices in the handoff at a boundary of adjacent sectors of the cell. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
-
-
12. A method of selecting a pilot pattern for a wireless communication device comprising:
-
determining whether a wireless communication device is in handoff between adjacent sectors of a cell; selecting a pilot pattern of a plurality of pilot patterns to be utilized for transmission by the wireless communication device based upon whether the wireless communication device is in the handoff, wherein the selected pilot pattern is indicative of the wireless communication device being in the handoff, and wherein a same pilot pattern is selected for different wireless communication devices in the handoff at a boundary of the adjacent sectors of the cell; and transmitting an indicator of the pilot pattern to the wireless communication device. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
-
Specification