SYSTEM AND METHOD FOR ADAPTIVE MODULATION AND POWER CONTROL IN A WIRELESS COMMUNICATION SYSTEM
First Claim
1. A wireless communication system having a base station and a remote unit, the system comprising:
- a base station transmitter configured to transmit data to the remote unit via a downlink, the base station transmitter capable of transmission using a plurality of modulation levels;
a remote unit receiver configured to receive the data transmitted by the base station transmitter via the downlink;
a remote unit transmitter configured to transmit data to the base station via an uplink, the remote unit transmitter capable of transmission at a plurality of transmitter power levels;
a base station receiver configured to receive the data transmitted by the remote unit transmitter via the uplink;
a base station controller configured to select a modulation level for the base station transmitter wherein the modulation level is adaptively altered, and the base station transmitter power level remains unchanged; and
a remote unit controller configured to select a transmitter power level for the remote unit transmitter wherein the remote unit transmitter power level is adaptively altered, and the remote unit modulation level remains unchanged.
11 Assignments
0 Petitions
Accused Products
Abstract
A system for adaptive modulation and power control in a wireless communication system includes a downlink from a base station to a remote unit and an uplink from the remote unit to the base station. The base station incorporates adaptive modulation on the downlink while power control is not utilized. In contrast, the remote unit utilizes a fixed modulation level and power control to control transmit power levels. In an exemplary embodiment, the remote unit uses QPSK modulation. The header of uplink messages include data from the remote unit to instruct the base station which modulation level to utilize on downlink transmissions. This provides closed-loop, non-iterative modulation control. In an exemplary embodiment, the modulation selection data is included in all uplink messages so that adaptive modulation can be communicated on a frame-by-frame basis.
-
Citations
37 Claims
-
1. A wireless communication system having a base station and a remote unit, the system comprising:
-
a base station transmitter configured to transmit data to the remote unit via a downlink, the base station transmitter capable of transmission using a plurality of modulation levels; a remote unit receiver configured to receive the data transmitted by the base station transmitter via the downlink; a remote unit transmitter configured to transmit data to the base station via an uplink, the remote unit transmitter capable of transmission at a plurality of transmitter power levels; a base station receiver configured to receive the data transmitted by the remote unit transmitter via the uplink; a base station controller configured to select a modulation level for the base station transmitter wherein the modulation level is adaptively altered, and the base station transmitter power level remains unchanged; and a remote unit controller configured to select a transmitter power level for the remote unit transmitter wherein the remote unit transmitter power level is adaptively altered, and the remote unit modulation level remains unchanged. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
-
-
14. A wireless communication system having a base station and a remote unit, the system comprising:
-
a base station transmitter configured to transmit data to the remote unit via a downlink, the base station transmitter capable of operation using a selected one of a plurality of modulation levels; a remote unit receiver configured to receive the data transmitted by the base station transmitter via the downlink; a remote unit transmitter configured to transmit data to the base station via an uplink, the remote unit transmitter capable of transmission at a selected one of a plurality of transmitter power levels; a base station receiver configured to receive the data transmitted by the remote unit transmitter via the uplink, the transmitted data including a plurality of modulation level selection data bits indicating the selected modulation level selection for use by the base station; a base station controller configured to select the modulation level for the base station transmitter to use on the downlink based on the modulation request data received from the remote unit; and a remote unit controller configured to select a transmitter power level for the remote unit transmitter to use on the uplink based on the modulation level selection data bits. - View Dependent Claims (15, 16, 17, 18, 19)
-
-
20. A wireless communication system having a base station assigned to communicate with a plurality of remote units, the system comprising:
-
a base station transmitter configured to transmit data to ones of the plurality of remote units assigned to the base station via a respective downlink, the base station transmitter being capable of transmission using a selected one of a plurality of modulation levels; a remote unit receiver at each of the remote units configured to receive the data transmitted by the base station transmitter via the respective downlink; a remote unit transmitter at each of the remote units configured to transmit data to the base station via a respective uplink, each of the remote unit transmitters being capable of transmission at a plurality of transmitter power levels; a base station receiver configured to receive the data transmitted by each of the remote unit transmitters via the respective uplink; a base station controller configured to individually select a modulation level for the base station transmitter for transmission to each of the remote units wherein the modulation level for communication on each respective downlink is adaptively altered, and the base station transmission power level remains unchanged; and a remote unit controller at each of the remote units configured to select a transmitter power level for each of the respective remote unit transmitters wherein the remote unit transmitter power level is adaptively altered, and the remote unit modulation level remains unchanged. - View Dependent Claims (21, 22, 23)
-
-
24. A communications protocol for use with a wireless communication system having a base station and a remote unit, the protocol comprising:
an uplink data message transmitted from the remote unit to the base station, the uplink data message including a header portion and a payload portion, the header portion comprising a plurality of modulation selection data bits indicating the selection of one of a plurality of modulation levels requested by the remote unit for downlink transmissions from the base station to the remote unit. - View Dependent Claims (25, 26)
-
27. A communications protocol for use with a wireless communication system having a base station and a remote unit, the protocol comprising:
a downlink data message transmitted from the base station to the remote unit, the downlink data message including a header portion and a payload portion, the header portion comprising a power control data bit to control transmission power by the remote unit when base station, the power control data bit being activated upon detection of external interference detected by the base station.
-
28. A method of operating a wireless communication system having a base station and a remote unit, comprising:
-
at the base station; receiving data from the remote unit via an uplink, the data including modulation selection data; adaptively selecting a modulation level for transmissions from the base station to the remote unit via a downlink based on the received modulation selection data; and transmitting data to the remote unit via the downlink using the selected modulation level wherein transmission power level is not adaptively adjusted; at the remote unit; receiving data from the base station via the downlink; analyzing the received data to determine a desired modulation level for future transmissions from the base station to the remote unit via the downlink; adaptively selecting a transmission power level for transmission of data from the remote unit to the base station via the uplink based on the analysis of the received data; and transmitting data to the base station via the uplink using the selected transmission power level wherein modulation level is not adaptively adjusted. - View Dependent Claims (29, 30, 31, 32, 33, 34, 35, 36, 37)
-
Specification