Unlock instant, AI-driven research and patent intelligence for your innovation.

Methods and Apparatus to Account for Effective Downlink Channels Arising from Beamforming Uplink Reference Signals

a reference signal and beamforming technology, applied in the field of wireless communication networks, can solve the problems of battery-operated or otherwise power-limited, per-antenna approaches are not feasible for a base station, and pose challenges for the typical wireless device, so as to improve the received signal quality and enhance the uplink channel estimation

Inactive Publication Date: 2018-06-07
TELEFON AB LM ERICSSON (PUBL)
View PDF0 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patent is about improving wireless communication by focusing the transmission of the uplink reference signal towards a specific device, and compensating for the beamforming when receiving a downlink transmission that was adapted based on the uplink channel transmission. This improves the quality of the received signal and allows for automatic compensation, without needing the network to know which precoder was used for the beamforming. This provides a significant advantage in wireless communication systems that use a large number of antennas.

Problems solved by technology

These per-antenna approaches are not feasible for a base station that uses a large number of downlink transmit antennas.
This requirement poses challenges for the typical wireless device, which generally is battery operated or otherwise power-limited.
Operation by a wireless device within a cell edge region exacerbates the problem of providing the network base station with reference signals of sufficiently high reception quality.
However, this disclosure recognizes that several disadvantages or problems attend the use of beamforming for uplink reference signal transmission.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Methods and Apparatus to Account for Effective Downlink Channels Arising from Beamforming Uplink Reference Signals
  • Methods and Apparatus to Account for Effective Downlink Channels Arising from Beamforming Uplink Reference Signals
  • Methods and Apparatus to Account for Effective Downlink Channels Arising from Beamforming Uplink Reference Signals

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0021]FIG. 1 illustrates an example network node 10 and an example wireless device 12. While not shown in FIG. 1, it shall be understood that the network node 10 forms part of a wireless communication network—the “network”—and the wireless device 12 is configured for operation in the network. The network comprises, for example, a Third Generation Partnership Project, 3GPP, cellular communication network such as a Long Term Evolution, LTE, network. Correspondingly, the network node 10 may be a cellular radio base station, such as an LTE eNB, and the wireless device 12 comprises a User Equipment or UE in 3GPP parlance. No limitations should be inferred by this example, however, and the wireless device 12 may comprise essentially any type of wireless communication apparatus, including a mobile communication device, a computer or other device with wireless networking capabilities, a Machine-Type Communication, MTC, device, etc.

[0022]The wireless device 12 includes two or more antennas 1...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

According to the teachings herein, a wireless device enhances uplink channel estimation at a node in a supporting wireless communication network by beamforming its uplink reference signal transmission towards the node, and correspondingly compensates for the effect of that beamforming when receiving a downlink transmission that was adapted in dependence on the uplink channel transmission. Such processing provides significant advantages in Multiple-Input-Multiple-Output, MIMO, systems that use a potentially large number of antennas for downlink MIMO transmissions and assume reciprocity between the uplink and downlink channels. In particular, uplink beamforming increases the received signal quality of the uplink reference signal used for estimating the uplink channel, while “automatic” compensation by the wireless device of the corresponding downlink transmission obviates the need for the network to know which precoder was used for uplink beamforming, or even that uplink beamforming is in use.

Description

RELATED APPLICATIONS[0001]This application is a continuation of U.S. application Ser. No. 14 / 890,550, filed Nov. 11, 2015, which is a U.S. National Phase Application of PCT / SE2015 / 051047, filed Oct. 5, 2015. The entire contents of each of the aforementioned applications are incorporated herein by reference.TECHNICAL FIELD[0002]The present invention relates to wireless communication networks, and particularly relates to accounting for the effect of beamforming uplink reference signals.BACKGROUND[0003]Ongoing technology and standardization developments make the use of large antenna arrays at cellular base stations and other wireless access points a viable option to boost the air interface capacities and maximum data rates of wireless communication networks. Consider a base station or an access point equipped with a large number of antennas. The node can simultaneously schedule multiple wireless devices in the same time / frequency band, using simple linear processing such as maximum-rat...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): H04B7/04H04W88/08H04B7/06H04B7/0417H04L25/03H04B7/08H04B7/0413
CPCH04B7/0634H04B7/0842H04L2025/03426H04B7/0478H04W88/08H04B7/04H04B7/0417H04B7/043H04B7/0665H04B7/0617H04L25/03H04B7/0413H04B7/0626H04L5/0048
Inventor MOOSAVI, REZAFODOR, GABORHESSLER, MARTIN
Owner TELEFON AB LM ERICSSON (PUBL)