US 7,773,535 B2 · Method and apparatus for closed loop transmission

Abstract

In a wireless communication system, a method and apparatus for closed loop transmission is disclosed. In accordance with the preferred embodiment of the present invention, a time frequency portion of an uplink frame is dynamically reserved as a sounding zone for uplink channel sounding. A first message is transmitted to a first subscriber station in a downlink frame assigning a time-frequency resource within the sounding zone, and a sounding waveform. Furthermore, a signal is received from the subscriber station within the assigned time-frequency resource, a partial channel response is determined from the received sounding signal, and the subsequent transmission to the subscriber station is tailored based on the at least partial channel response.

Claims13

Dependent claims

A method for enabling a base station (BS) to determine a BS-to-subscriber station (SS) channel response under an assumption of channel reciprocity, the method comprising the steps of:

the base station determining an uplink sounding zone within a frame, wherein the uplink sounding zone comprises a time and frequency resource;
and
the base station instructing the SS to transmit a specific sounding signal at one or more specific symbol intervals within the uplink sounding zone, and the base station specifying a specific sounding frequency to be occupied within each sounding symbol interval.

Dependencies are inferred from the claim text.

Facts

Application

11/004,262Filed 3 Dec 2004 · us provisional application

Priority

12 Aug 2004

Published

US 2006/0035643 A116 Feb 2006

Granted

10 Aug 2010

Term ends

Not estimatedThe source records don’t support an estimate.

Classification14 codes

H04L 5/0094
Signalling for the administration of the divided path, e.g. signalling of configuration information: indication of how sub-channels of the path…
H04L 5/0051
Allocation of pilot signals, i.e. of signals known to the receiver: of dedicated pilots, i.e. pilots destined for a single user or terminal
H04L 25/03343
Arrangements for removing intersymbol interference: arrangements at the transmitter end
H04L 27/2613
Details of reference signals: structure of the reference signals

Method and apparatus for closed loop transmission

Life of this patent

Method and apparatus for closed loop transmission

Life of this patent

Abstract

Claims13