Pilot structure for time division duplex downlink
AssigneeNokia Corporation
InventorsUlo Parts, Kaj Jansen
Life of this patent
Estimating the term…
Abstract
The specification and drawings present a new method, system, apparatus and software product for using DL sub-frames with a unique pilot structure for TDD communications between a network element and a user equipment. In order to have equally good estimation for, e.g., channel, SIR and/or CQI estimation in the edges of a TDD sub-frame, the pilot structure should take into account UL/DL frame boundaries. In other words, a DL TDD sub-frame (e.g., 0.5 ms in duration) or sub-frames, adjacent in time domain to an UL TDD sub-frame can have higher total pilot energy than non-adjacent downlink TDD sub-frames by a pre-selected value or values.
Claims27
A method, comprising:
- receiving one or more pilots in a downlink time division duplex sub-frame of a downlink signal by a user equipment from a network element, said downlink time division duplex sub-frame being adjacent in time domain to an uplink time division duplex sub-frame, wherein said downlink time division duplex sub-frame has higher total pilot energy than non-adjacent downlink time division duplex sub-frames comprised in said downlink signal by a pre-selected value;
- and
- making one or more estimations for said downlink time division duplex sub-frame using said one or more pilots by said user equipment.
A user equipment, comprising:
- an uplink scheduling and signal generating module, responsive to one or more pilots comprised in a downlink time division duplex sub-frame of a downlink signal provided by a network element, configured to make one or more estimations for said downlink time division duplex sub-frame using said one or more pilots, said downlink time division duplex sub-frame being adjacent in time domain to an uplink time division duplex sub-frame, wherein said downlink time division duplex sub-frame has higher total pilot energy than non-adjacent downlink time division duplex sub-frames comprised in said downlink signal by a pre-selected value;
- and
- a module, configured to receive said downlink signal.
A user equipment, comprising:
- means for managing, responsive to one or more pilots comprised in a downlink time division duplex sub-frame of a downlink signal provided by a network element, configured to make one or more estimations for said downlink time division duplex sub-frame using said one or more pilots, said downlink time division duplex sub-frame being adjacent in time domain to an uplink time division duplex sub-frame, wherein said downlink time division duplex sub-frame has higher total pilot energy than non-adjacent downlink time division duplex sub-frames comprised in said downlink signal by a pre-selected value;
- and
- means for transmitting and receiving, for receiving said downlink signal.
A communication system, comprising:
- a network element, configured to provide one or more pilots in a downlink time division duplex sub-frame of a downlink signal, said downlink time division duplex sub-frame being adjacent in time domain to an uplink time division duplex sub-frame, wherein said downlink time division duplex sub-frame has higher total pilot energy than non-adjacent downlink time division duplex sub-frames comprised in said downlink signal by a pre-selected value;
- and
- a user equipment, responsive to said downlink signal, configured to make one or more estimations for said downlink time division duplex sub-frame using said one or more pilots.
A network element, comprising:
- a scheduling and signal generating module, configured to provide one or more pilots in a downlink time division duplex sub-frame of a downlink signal to a user equipment, said downlink time division duplex sub-frame being adjacent in time domain to an uplink time division duplex sub-frame, wherein said downlink time division duplex sub-frame has higher total pilot energy than non-adjacent downlink time division duplex sub-frames comprised in said downlink signal by a pre-selected value;
- and
- a transmitter, configured to transmit said downlink signal.
Dependencies are inferred from the claim text.