Optimizing downlink communications between a base station and a remote terminal by power sharing

A downlink, base station technology, applied in the field of downlink communication

Inactive Publication Date: 2012-10-03
APPLE INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In particular, two main issues arise: feasibility and optimality

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  • Optimizing downlink communications between a base station and a remote terminal by power sharing
  • Optimizing downlink communications between a base station and a remote terminal by power sharing
  • Optimizing downlink communications between a base station and a remote terminal by power sharing

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Embodiment Construction

[0058] Wireless System Overview

[0059] With reference to the accompanying drawings, figure 1 A base station controller (BSC) 10 is shown controlling wireless communications within a plurality of cells 12 served by corresponding base stations (BS) 14 . In some configurations, each cell is also divided into a number of sectors 13 or regions (not shown). Generally, each base station 14 facilitates communication using an Orthogonal Frequency Division Multiplexing (OFDM) digital modulation scheme with mobile stations (MS) and / or wireless terminals 16 that are in a corresponding within the cell 12 associated with the base station 14 .

[0060] Movement of the mobile station 16 relative to the base station 14 causes significant fluctuations in channel conditions. As shown, base stations 14 and mobile stations 16 may include multiple antennas for providing spatial diversity of communications. In some configurations, relay station 15 may facilitate communication between base st...

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Abstract

A method of optimizing downlink for communications between a base station and mobile stations in a wireless communication system involves acquiring user identifiers and geometry values for mobile stations that are associated with registered users of the system, associating modulation control scheme (MCS) power values with respective users in response to respective geometry values, initializing a power pool, identifying users that have an MCS power value greater than a reference MCS power value as high power users and calculating a power difference for each of the high power users. The power difference is a difference between the geometry value associated with each of the high power users and a reference geometry value associated with the reference MCS power value respectively. The power differences associated with respective high power users are accumulated in the power pool, by summing the power differences. Users that have an MCS power value below the reference MCS power value are identified as low power users and increased geometry values are associated with at least some of the low power users while the power pool is reduced by corresponding amounts until the power pool is depleted. New MCSs are then determined for at least some of the low power users based on the increased geometry values and control information is transmitted to the low power users using modulation and control schemes identified by the corresponding new MCSs at power levels associated with the new MCSs.

Description

[0001] Cross References to Related Applications [0002] This application claims priority to US 61 / 078,520, filed July 7, 2008, and US 61 / 223,148, filed July 6, 2009. technical field [0003] The present application relates to optimizing downlink communication between a base station and a remote terminal by power sharing in a wireless communication system, and more particularly, to base station controlled power sharing for downlink communication optimization. Background technique [0004] The draft IEEE 802.16m System Description document IEEE 802.16m-08 / 003r1 dated April 15, 2008 intends to amend the IEEE 802.16 WirelessMAN-OFDMA specification to provide an advanced air interface for operation in licensed frequency bands. The draft intends to describe provisions that meet the cellular layer requirements of IMT-advanced next-generation mobile networks and provide continuous support for legacy Wireless MAN-OFDMA equipment. Furthermore, the purpose of this draft is to provide...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W52/34H04W24/10H04W52/24
CPCH04W52/225H04W52/262H04W52/346Y02B60/50H04W52/283H04W52/24H04W52/34H04W72/00Y02D30/70
Inventor J.袁房慕娴
Owner APPLE INC
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