Wireless access system using multiple modulation formats in TDD frames and method of operation

• US 20120281598A1
• Filed: 04/30/2012
• Published: 11/08/2012
• Est. Priority Date: 01/19/2001
• Status: Active Grant

• Current Assignee: Paul F. Struhsaker, Robert R. Nelson, Russell C. Mckown
• Original Assignee: Paul F. Struhsaker, Robert R. Nelson, Russell C. Mckown
• Inventors: Struhsaker, Paul F., Nelson, Robert R., McKown, Russell C.
• Granted Patent: US 9,130,697 B2
• Time in Patent Office: Days
• US Class Current: 370/280
• CPC Class Codes: H04L 1/0003 by switching between different modulation schemes
• CPC Class Codes: H04L 1/1825 Adaptation of specific ARQ protocol parameters according to transmission conditions
• CPC Class Codes: H04L 5/0005 Time-frequency

Abstract

A radio frequency (RF) modem shelf for use in a fixed wireless access network comprising, a plurality of base stations capable of bidirectional time division duplex (TDD) communication with wireless access devices disposed at subscriber premises. The shelf comprises: a) a first RF modem for communicating with wireless access devices using TDD frames, each TDD frame having an uplink for, receiving data and a downlink for transmitting data; and b) a modulation controller associated with the RF modem shelf for determining an optimum modulation configuration for each of the wireless access devices communicating with the first RF modem. The controller causes the first RF modem to transmit downlink data to a first wireless access device in a first data block having a first optimum modulation configuration and to transmit downlink data to a second wireless access device in a second data block having a different second optimum modulation configuration.

Claims

1. A system for communicating with a plurality of wireless access devices, comprising:

at least one modem that communicates with the plurality of wireless access devices using time division duplex (TDO) frames, each TDD frame having an uplink portion for receiving data and a downlink portion for transmitting data; and

at least one controller associated with the at least one modem that assigns each of the plurality of wireless access devices to at least one of a plurality of modulation groups, determines a modulation configuration for each of the plurality of modulation groups, and causes the modem to transmit downlink data to wireless access devices assigned to a first of the plurality of modulation groups using a first modulation configuration and transmit downlink data to wireless access devices assigned to a second of the plurality of modulation groups using a second modulation configuration, wherein at least one of the plurality of modulation groups has at least two of the plurality of wireless access devices assigned to it, and wherein the first modulation configuration is different from the second modulation configuration.

2. A system for communicating with a plurality of wireless access devices, comprising:

at least one modem that communicates with the plurality of wireless access devices using time division duplex (TDD) frames, each TDD frame having an uplink portion for receiving data and a downlink portion for transmitting data; and

at least one controller associated with the at least one modem that;

determines a first combination of a modulation configuration and a beam forming to be applied to downlink data transmitted to a first of the plurality of wireless access devices;

determines a second combination of a modulation configuration and a beam forming to be applied to downlink data transmitted to a second of the plurality of wireless access devices;

causes the at least one modem to transmit downlink data to the first of the plurality of wireless access devices using the first combination; and

causes the at least one modem to transmit downlink data to the second of the plurality of wireless access devices using the second combination,

wherein the first combination is different from the second combination.