WO2006019263A2 - A method for establishing fast feedback channel and transmitting information in a wireless communication system - Google Patents

A method for establishing fast feedback channel and transmitting information in a wireless communication system Download PDF

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Publication number
WO2006019263A2
WO2006019263A2 PCT/KR2005/002703 KR2005002703W WO2006019263A2 WO 2006019263 A2 WO2006019263 A2 WO 2006019263A2 KR 2005002703 W KR2005002703 W KR 2005002703W WO 2006019263 A2 WO2006019263 A2 WO 2006019263A2
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WO
WIPO (PCT)
Prior art keywords
channel
feedback information
feedback
information
mss
Prior art date
Application number
PCT/KR2005/002703
Other languages
French (fr)
Other versions
WO2006019263A3 (en
Inventor
Jin Young Chun
Bin Chul Ihm
Yong Suk Jin
Original Assignee
Lg Electronics Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from KR1020040064542A external-priority patent/KR20060016184A/en
Priority claimed from KR1020040064553A external-priority patent/KR20060016193A/en
Application filed by Lg Electronics Inc. filed Critical Lg Electronics Inc.
Priority to CN2005800281752A priority Critical patent/CN101124743B/en
Priority to US11/573,686 priority patent/US7907950B2/en
Priority to EP05776004.3A priority patent/EP1790088B1/en
Priority to JP2007527050A priority patent/JP5288798B2/en
Publication of WO2006019263A2 publication Critical patent/WO2006019263A2/en
Publication of WO2006019263A3 publication Critical patent/WO2006019263A3/en

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/20—Monitoring; Testing of receivers
    • H04B17/24—Monitoring; Testing of receivers with feedback of measurements to the transmitter
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • H04B7/0621—Feedback content
    • H04B7/0632—Channel quality parameters, e.g. channel quality indicator [CQI]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • H04B7/0621—Feedback content
    • H04B7/0634—Antenna weights or vector/matrix coefficients
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H04L1/0026—Transmission of channel quality indication
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/02—Arrangements for detecting or preventing errors in the information received by diversity reception
    • H04L1/06—Arrangements for detecting or preventing errors in the information received by diversity reception using space diversity
    • H04L1/0618—Space-time coding
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
    • H04L5/0057—Physical resource allocation for CQI
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0091—Signaling for the administration of the divided path
    • H04L5/0094—Indication of how sub-channels of the path are allocated
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0667—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of delayed versions of same signal
    • H04B7/0673—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of delayed versions of same signal using feedback from receiving side
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/20—Arrangements for detecting or preventing errors in the information received using signal quality detector
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0014—Three-dimensional division
    • H04L5/0023—Time-frequency-space
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal

Definitions

  • the present invention relates to a method of establishing
  • OFDM/OFDMA OFDM/OFDMA
  • BS base station
  • the feedback information is received from a mobile subscriber station (MSS) .
  • MSS mobile subscriber station
  • weight value (s) or channel information includes weight value (s) or channel information.
  • the feedback information relates to various determined (or measured) information of the BS transmission signals.
  • the feedback information provides
  • the determined information can include various determined value (s) of downlink
  • the downlink signal can be a signal/noise (S/N) value or a
  • MIMO multi-output
  • Figure 1 illustrates an example of a MSS sending to a BS
  • the BS which uses a plurality
  • the STC mode via a STC zone IE message.
  • the STC mode is determined
  • the BS notifies the MSS which matrix type (e.g.,
  • the multi-input multi-output (MIMO) downlink (DL) basic IE message is the avenue
  • the BS notifies to the MSS
  • CQICH Channel Quality Indicator Channel
  • Allocation IE message the mapping scheme of the weight value to be assigned to the uplink high speed feedback
  • the MSS determines the downlink channel
  • the size of the weight matrix is determined by the number of BS
  • the MSS sends feedback of the weight matrix W and the
  • SNR noise ratio
  • the BS uses a plurality of transmission antennas, the BS receives
  • the BS allocates the uplink CQICH to the MSS in
  • an uplink slot indicates one sub-channel zone, which encompasses three symbols, and is comprised of six tiles.
  • 802.16 OFDMA system refers to the smallest unit available for data allocation and can be expressed in time domain
  • a tile comprises eight
  • Table 2 shows sub-carrier modulation method as
  • the MSS using a plurality of antennas has to receive
  • the feedback information includes the uplink determined value (channel information
  • the present invention is directed to a
  • An object of the present invention is to provide a method
  • Another object of the present invention is to provide a
  • a further object of the present invention is to provide a wireless communication system for transmitting information.
  • Another object of the present invention is to provide a
  • Another object of the present invention is to provide a
  • BS base station
  • the BS uses the received data to determine quality of the
  • the BS transmits feedback
  • the feedback information is based on the determined quality of the uplink channel.
  • BS base station
  • the physical resource for the downlink fast feedback is the physical resource for the downlink fast feedback
  • the BS establishes a modulation
  • BS transmits the modulation pattern, which corresponds to
  • MSS mobile subscriber station
  • MSS mobile subscriber station
  • the MSS receives feedback information
  • the feedback information is based on quality of the uplink channel, and the quality of the
  • uplink channel is determined based on the transmitted data.
  • the modulation pattern is a mobile subscriber station (MSS) which receives and detects a modulation pattern transmitted from a base station (BS) .
  • MSS mobile subscriber station
  • BS base station
  • the MSS determines
  • the MSS transmits
  • uplink data which is configured by using the feedback
  • FIG. 1 illustrates an example of a mobile subscriber
  • a base station sending to a base station feedback information, which includes weight values (or channel information) ,
  • FIG. 2 illustrates an example of the BS sending feedback
  • FIG. 3 illustrates an example of setting a determined
  • FIG. 4 illustrates an example of a format of an IE message
  • FIG. 5 illustrates an example of a format of an IE message
  • FIG 6. is an example of a format illustrating the CQICH DL
  • FIG. 7 is an example of a structure of a wireless communication system illustrating an operation of
  • FIG. 8 illustrates an example of a basic allocation unit
  • FIG. 9 illustrates an example of a basic allocation unit
  • FIG. 10 illustrates an example of a composition of data
  • FIG. 11 illustrates an example of a composition of data
  • a base station In an embodiment of the present invention, a base station
  • BS sends feedback information to a mobile subscriber
  • MSS mobile station
  • the feedback information includes a channel
  • the BS informs
  • the BS establishes the CQI or weight value to the fast downlink feedback
  • the notification of the fast downlink feedback is provided.
  • channel to the MSS is carried out via a DIUC message or a
  • CQICH Channel
  • Figure 2 illustrates an example of the BS sending feedback
  • the BS allocates the uplink high speed feedback
  • the MSS which uses multiple antennas, to achieve transmission diversity gain.
  • the MSS the BS transmits feedback information concerning
  • the BS uses the DIUC or the DL fast feedback
  • the BS transmits the uplink channel quality assessed
  • Figure 4 and Figure 5 illustrate examples of a format of
  • Figure 4 is an
  • Figure 6 is an example of a format illustrating the CQICH DL location IE message which includes the weight value and channel information of the
  • each CQICH location IE occupies one downlink
  • Figure 7 is an example of a structure of a wireless
  • the BS receives via the receiver
  • the BS can receive data as well as other types of data and
  • the BS can then use the
  • transmitter 22 to transmit feedback information to the MSS.
  • the feedback information is based on the determined
  • the MSS transmits data first to the BS via the transmitter 14.
  • the receiver 13 of the MSS receives the feedback information from the BS.
  • Another embodiment of the present invention relates to allocating a physical channel space to provide fast feedback channel in a downlink direction and defining a
  • the BS can send feedback information, including channel quality information and weight value (s), received
  • Figure 8 is an example illustrating a basic allocation
  • the PUSC mode provides a permutation scheme whereby only
  • partial sub-channels are used in transmitting data.
  • each cluster has 12 data sub- carriers.
  • the FUSC mode provides a permutation scheme whereby full
  • a slot of the FUSC mode signifies a sub-channel comprising one symbol and 48 data sub-
  • each slot possesses 48 data sub-carriers
  • one slot is allocated to the fast feedback channel in downlink
  • the same modulation method can be
  • Figure 10 and Figure 11 are example illustrating a
  • each small group includes eight sub-carriers.
  • Table 3 illustrates a sub-carrier modulation
  • BPSK Quadrature Phase Shift Keying
  • QPSK Quadrature Phase Shift Keying
  • each vector index in Table 4 may vary.
  • controller 20 of the BS allocates a physical resource for a downlink fast feedback channel and establishes a
  • the physical resource for the downlink is not limited to the BS.
  • the physical resource for the downlink is not limited to the BS.
  • the transmitter 22 of the BS transmits the modulation
  • a receiver 13 receives the modulation pattern
  • the modulation pattern was established to the downlink fast feedback
  • a controller 10 of the MSS detects the modulation pattern transmitted from the BS and determines which feedback
  • transmitter 14 of the MSS transmits an uplink data, which

Abstract

A method of transmitting information in a wireless communication system is disclosed. More specifically, the method includes a base station (BS) which receives data from a mobile subscriber station (MSS) via an uplink channel. Using the received data, the BS determines quality of the uplink channel. Thereafter, the BS transmits feedback information to the MSS. Here, the feedback information is based on the determined quality of the uplink channel.

Description

[DESCRIPTION]
A METHOD FOR ESTABLISHING FAST FEEDBACK CHANNEL AND
TRANSMITTING INFORMATION IN A WIRELESS COMMUNICATION SYSTEM
Technical Field
The present invention relates to a method of establishing
feedback channel and transmitting information, and more
particularly, to a method of establishing fast feedback
channel and transmitting information in a wireless
communication system having multiple antennas.
Background Art
In an Orthogonal Frequency Division
Multiplexing/Orthogonal Frequency Division Multiplexing
Access (OFDM/OFDMA) system, a base station (BS) , which
supports a plurality of antennas, can attain transmission
diversity gain by receiving feedback information from a mobile subscriber station (MSS) . The feedback information
includes weight value (s) or channel information. Here, the
feedback information is transmitted from the MSS to the BS
via an uplink transmission high speed (or fast) feedback channel .
In detail, the feedback information relates to various determined (or measured) information of the BS transmission signals. The feedback information provides
necessary information for the BS to transmit more accurate
transmission signals. Here, the determined information can include various determined value (s) of downlink
transmission signals. For example, the determined value of
the downlink signal can be a signal/noise (S/N) value or a
weight or selected mode value (space-time transmit
diversity or spatial multiplexing) in case of multi-input
multi-output (MIMO) .
Figure 1 illustrates an example of a MSS sending to a BS
feedback information, which includes weight values (or
channel information) , acquired in a downlink transmission.
As illustrated in Figure 1, the BS, which uses a plurality
of antennas, informs the MSS of a space-time coding (STC)
mode via a STC zone IE message. The STC mode is determined
based on a number of antennas possessed by the BS . At the
same time, the BS notifies the MSS which matrix type (e.g.,
type B) the BS plans to use. The multi-input multi-output (MIMO) downlink (DL) basic IE message is the avenue
through which the BS notifies the MSS of which matrix type
it plans to use. Furthermore, the BS notifies to the MSS
via a Channel Quality Indicator Channel (CQICH) Enhanced
Allocation IE message the mapping scheme of the weight value to be assigned to the uplink high speed feedback
channel. On the other hand, the MSS determines the downlink channel
quality or acquires a weight matrix W based on the
downlink channel quality determination. The size of the weight matrix is determined by the number of BS
transmission antennas and the number of output signals
according to the STC scheme. The following Equation 1 is
an example of the weight matrix W in connection with four
BS transmission antennas and two STC outputs.
[Equation 1]
Figure imgf000005_0001
The MSS sends feedback of the weight matrix W and the
channel quality information acquired through Equation 1
via the CQICH (S12) . In order to improve the signal-to-
noise ratio (SNR) in the receiving end by the BS, which
uses a plurality of transmission antennas, the BS receives
a downlink determined value or a weight value. At the same
time, the BS allocates the uplink CQICH to the MSS in
order to receive the downlink determined value or weight
value.
Additionally, in the existing 802.16 OFDMA system, a
message of the fast feedback channel of the uplink is allocated to an uplink slot. Here, an uplink slot indicates one sub-channel zone, which encompasses three symbols, and is comprised of six tiles. A slot of IEEE
802.16 OFDMA system refers to the smallest unit available for data allocation and can be expressed in time domain
and sub-channel domain. Moreover, a tile comprises eight
data sub-carriers.
Table 1 provided below shows a method by which sub-
carriers of a fast feedback channel are modulated.
Moreover, Table 2 shows sub-carrier modulation method as
applied to each vector of Table 1.
[Table 1]
Figure imgf000006_0001
ObIlOl 6, 7, O, I,2
ObIIlO 6, 7, O, 1, 2, 3
Obllll 7, O, 1, 2, 3, 4
[Table 2]
Vector Data sub-carrier modulation Index method per each vector index (sub-carrier 0, sub-carrier 1 ... sub-carrier 7) I Lf
0 PO, Pl, P2, P3, PO, Pl, P2, P3
1 PO, P3, P2, Pl, PO, P3, P2, Pl
2 PO, PO, Pl, Pl, P2, P2, P3, P3
3 PO, PO, P3, P3, P2, P2, Pl, Pl
4 PO, PO, PO, PO, PO, PO, PO, PO
5 PO, P2, PO, P2, PO, P2, PO, P2
6 PO, P2, PO, P2, P2, PO, P2, PO
7 PO, P2, P2, PO, P2, PO, PO, P2
As shown in Table 1 and Table 2, the feedback information
is expressed as payload in four (4) bits, and based the
payload value, vector indices of six (6) tiles to be used
in the fast feedback channel can be attained. Furthermore,
eight (8) sub-carriers are provided with different modulation values based on each vector index.
The following are equations regarding each
modulation scheme (PO, Pl, P2, P3) with respect to Table 2.
Figure imgf000008_0001
The MSS using a plurality of antennas has to receive
feedback information from the BS in order to achieve
transmission diversity. The feedback information includes the uplink determined value (channel information
or weight value) . However, there is not a defined channel
which allows for fast feedback of the BS determined value
to the MSS.
Disclosure of Invention
Accordingly, the present invention is directed to a
[title] that substantially obviates one or more problems
due to limitations and disadvantages of the related art.
An object of the present invention is to provide a method
of transmitting information in a wireless communication
system.
Another object of the present invention is to provide a
method of receiving information in a wireless communication system.
A further object of the present invention is to provide a wireless communication system for transmitting information.
Another object of the present invention is to provide a
method of establishing a fast feedback channel and
transmitting information thereto. Another object of the present invention is to provide a
method of receiving transmitted information through an
established fast feedback channel.
Additional advantages, objects, and features of the invention will be set forth in part in the description
which follows and in part will become apparent to those
having ordinary skill in the art upon examination of the
following or may be learned from practice of the invention.
The objectives and other advantages of the invention may be realized and attained by the structure particularly
pointed out in the written description and claims hereof
as well as the appended drawings.
To achieve these objects and other advantages and in
accordance with the purpose of the invention, as embodied and broadly described herein, a method of transmitting
information in a wireless communication system which
includes a base station (BS) which receives data from a
mobile subscriber station (MSS) via an uplink channel. Using the received data, the BS determines quality of the
uplink channel. Thereafter, the BS transmits feedback
information to the MSS. Here, the feedback information is based on the determined quality of the uplink channel. In another aspect of the present invention, a method of
transmitting information in a wireless communication
system which includes a base station (BS) which allocates
a physical resource for a downlink fast feedback channel.
Here, the physical resource for the downlink fast feedback
channel is different from a physical resource for a data
channel. Furthermore, the BS establishes a modulation
pattern, which corresponds to feedback information, to the
downlink fast feedback channel by the BS. In addition, the
BS transmits the modulation pattern, which corresponds to
feedback information, to a mobile subscriber station (MSS)
so that the MSS can determine which feedback information
is transmitted from the BS via the modulation pattern.
In another aspect of the present invention, a method of
receiving information in a wireless communication system
which includes a mobile subscriber station (MSS) which
transmits data to a base station (BS) via an uplink
channel. Thereafter, the MSS receives feedback information
from the MSS. Here, the feedback information is based on quality of the uplink channel, and the quality of the
uplink channel is determined based on the transmitted data. In another aspect of the present invention, a method of
receiving information in a wireless communication system
which includes a mobile subscriber station (MSS) which receives and detects a modulation pattern transmitted from a base station (BS) . Here, the modulation pattern is
established to a downlink fast feedback channel, and
importantly, the modulation pattern corresponds to
feedback information. Furthermore, the MSS determines
which feedback information is transmitted from the BS via
the modulation pattern. After determining which feedback
information is transmitted from the BS, the MSS transmits
uplink data which is configured by using the feedback
information.
It is to be understood that both the foregoing general
description and the following detailed description of the
present invention are exemplary and explanatory and are
intended to provide further explanation of the invention
as claimed.
Brief Description of Drawings
The accompanying drawings, which are included to provide a
further understanding of the invention and are
incorporated in and constitute a part of this application,
illustrate embodiment (s) of the invention and together
with the description serve to explain the principle of the
invention. In the drawings;
FIG. 1 illustrates an example of a mobile subscriber
station sending to a base station feedback information, which includes weight values (or channel information) ,
acquired in a downlink transmission;
FIG. 2 illustrates an example of the BS sending feedback
information, which includes the result of uplink channel quality assessment, to the MSS in the OFDM/OFDMA system
according to an embodiment of the present invention;
FIG. 3 illustrates an example of setting a determined
uplink value to a specified physical resource of a fast
feedback channel;
FIG. 4 illustrates an example of a format of an IE message
of a downlink high speed feedback channel using an
extended DIUC; and
FIG. 5 illustrates an example of a format of an IE message
of a downlink high speed feedback channel using an OFDMA
DIUC value;
FIG 6. is an example of a format illustrating the CQICH DL
location IE message which includes the weight value and
channel information of the BS;
FIG. 7 is an example of a structure of a wireless communication system illustrating an operation of
transmitting/receiving information between the BS and the
MSS.
FIG. 8 illustrates an example of a basic allocation unit
of a fast feedback channel in a downlink Partial Usage of Sub-Channels (PUSC) mode; FIG. 9 illustrates an example of a basic allocation unit
■ of a fast feedback channel in a downlink Full Usage of
Sub-Channels (FUSC) mode;
FIG. 10 illustrates an example of a composition of data
sub-carriers; and
FIG. 11 illustrates an example of a composition of data
sub-carriers.
Best Mode for Carrying Out the Invention
Reference will now be made in detail to the preferred
embodiments of the present invention, examples of which
are illustrated in the accompanying drawings. Wherever
possible, the same reference numbers will be used
throughout the drawings to refer to the same or like parts.
The embodiments of the present invention can apply to an
Orthogonal Frequency Division Multiplexing/Orthogonal
Frequency Division Multiplexing Access (OFDM/OFDMA) system
and also can be applied to other standards wireless communication system. Examples related to the embodiments
of the present invention are provided below.
In an embodiment of the present invention, a base station
(BS) sends feedback information to a mobile subscriber
station (MSS) via a fast (or high speed) downlink feedback
channel . The feedback information includes a channel
quality information (CQI) and weight value (s) received through uplink channel (s) . In operation, the BS informs
the MSS of the fast downlink feedback channel through
which data is transmitted. Thereafter, the BS establishes the CQI or weight value to the fast downlink feedback
channel and transmits the information to the MSS.
Preferably, the notification of the fast downlink feedback
channel to the MSS is carried out via a DIUC message or a
downlink (DL) fast feedback channel IE message. Here, the
CQI or the weight values are transmitted via the CQI
Channel (CQICH) DL location IE message.
Figure 2 illustrates an example of the BS sending feedback
information, which includes the result of uplink channel
quality assessment, to the MSS in the OFDM/OFDMA system according to the embodiment of the present invention. In
Figure 2, as explained above, the BS assigns the STC mode
to the MSS based the number of BS transmission antennas
via the STC zone IE message. At the same time, the MSS
acquires weight matrix (W=Nt x Mt) . The weight matrix is
derived based on the number of BS transmission antennas
and the number of output signals from the STC scheme.
Moreover, the BS allocates the uplink high speed feedback
channel, also referred to as the CQICH, to the MSS.
Subsequently, the MSS notifies of the weight matrix (W=Nt
x Mt) to the BS via the allocated CQICH, and the BS, as a result is able to attain transmission diversity gain by receiving from the MSS the weight value for each channel .
However, in order for the MSS, which uses multiple antennas, to achieve transmission diversity gain, the MSS
has to receive feedback information on uplink channel
quality value (channel information or weight value) from
the BS. In other words, after the steps (S10-S13) are
performed and the BS receives the downlink channel quality
assessed value (channel information or weight value) from
the MSS, the BS transmits feedback information concerning
the uplink channel quality assessed value (channel
information or weight value) to the MSS.
Furthermore, the BS uses the DIUC or the DL fast feedback
channel IE message to notify the MSS of the high speed
downlink feedback channel (S14) . As illustrated in Figure
3, the BS transmits the uplink channel quality assessed
value (channel information or weight value) to the MSS on
an assigned specific location (or space) of the high speed
downlink feedback channel (S15) .
Figure 4 and Figure 5 illustrate examples of a format of
an IE message for the BS notifying the MSS of the high
speed downlink feedback channel. Here, Figure 4 is an
example using an extended DIUC, and Figure 5 is an example
using OFDMA DIUC value.
Furthermore, Figure 6 is an example of a format illustrating the CQICH DL location IE message which includes the weight value and channel information of the
BS. Here, each CQICH location IE occupies one downlink
(DL) slot, and as illustrated in Figure 3, the DIUC = 14
or the DL fast feedback channel IE is assigned to the high
speed downlink feedback channel.
Figure 7 is an example of a structure of a wireless
communication system illustrating an operation of
transmitting/receiving information between the BS and the
MSS. More specifically, the BS receives via the receiver
21 data from the MSS via an uplink channel to determine
the quality of the uplink channel by the controller 20.
The BS can receive data as well as other types of data and
information through which channel status and/or quality
can be determined, for example. The BS can then use the
transmitter 22 to transmit feedback information to the MSS.
Here, the feedback information is based on the determined
quality of the uplink channel.
In order for communication to take place, the MSS transmits data first to the BS via the transmitter 14.
After the controller 20 of the BS determines the quality
of the uplink channel and transmits via the transmitter 22,
the receiver 13 of the MSS receives the feedback information from the BS.
Another embodiment of the present invention relates to allocating a physical channel space to provide fast feedback channel in a downlink direction and defining a
sub-carrier modulation method for the feedback channel so
that the BS can send feedback information, including channel quality information and weight value (s), received
in the uplink transmission, to the MSS via a defined
feedback channel .
Figure 8 is an example illustrating a basic allocation
unit of a fast feedback channel in a downlink Partial Usage of Sub-Channels (PUSC) mode. Figure 9 is an example
illustrating a basic allocation unit of a fast feedback
channel in a downlink Full Usage of Sub-Channels (FUSC)
mode. In IEEE 802.26 OFDMA system, the downlink frame
fundamentally provides the PUSC and FUSC modes.
The PUSC mode provides a permutation scheme whereby only
partial sub-channels are used in transmitting data. As
illustrated in Figure 8, a slot of the PUSC mode signifies
a sub-channel comprised of two symbols and of four
clusters. Furthermore, each cluster has 12 data sub- carriers.
The FUSC mode provides a permutation scheme whereby full
or all sub-channels are used in transmitting data. As
illustrated in Figure 9, a slot of the FUSC mode signifies a sub-channel comprising one symbol and 48 data sub-
carriers, as in the PUSC mode. Furthermore, both in the
PUSC mode and the FUSC mode, each slot possesses 48 data sub-carriers,
In the present embodiment, as is the case in the fast
feedback channel in the downlink direction, one slot is allocated to the fast feedback channel in downlink
direction. In other words, the slot indicated in Figures 1
and 2 can be expressed as the basic allocation unit of the
physical channel space of the fast feedback channel.
Because the PUSC mode and the FUSC mode each include 48 data sub-carriers, the same modulation method can be
applied despite the differences in shapes of the two modes.
Figure 10 and Figure 11 are example illustrating a
composition of data sub-carriers. In Figures 10 and 11, 48
data sub-carriers can be divided into six small groups. Furthermore, each small group includes eight sub-carriers.
With this arrangement, the downlink fast feedback channel
can apply the composition of the uplink fast feedback
channel . Table 3 illustrates a sub-carrier modulation
method of a feedback channel according to the embodiment
of the present invention.
[Table 3]
4 Vector indices to be used by bit fast feedback channel per small payload group
(small group 0, small group 1... small group 5
ObOOOO 0,0,0,0,0,0
Figure imgf000019_0001
In Table 3, the order combination(s) of vector indices
according to payload and the small groups (0-5) can be
changed. Table 4 of below shows data sub-carrier
modulation method for each vector of Table 3.
[Table 41
Figure imgf000019_0002
4 PO, PO, PO, PO, PO, po, PO, PO
5 PO, P2, PO, P2, PO, P2, PO, P2
6 PO, P2, PO, P2, P2, PO, P2, PO
7 PO, P2, P2, PO, P2, PO, PO, P2
The fast feedback channel modulation according to the
embodiment of the present invention can use various
modulation techniques such as Binary Phase Shift Keying
(BPSK) , Quadrature Phase Shift Keying (QPSK) , and 16
Quadrature Amplitude Modulation (16QAM) . Each modulation
techniques (PO, Pl, P2, P3) of Table 4 shows an example of the QPSK technique applied to the OFDM/OFDMA system.
Furthermore, the modulation order combination(s) according
to each vector index in Table 4 may vary.
To describe another operation of transmitting/receiving
information between the BS and the MSS in a wireless communication system for transmitting information, the
structure of Figure 7 will be used, along with the number
labels, to explain the operation. In operation, a
controller 20 of the BS allocates a physical resource for a downlink fast feedback channel and establishes a
modulation pattern to the downlink fast feedback channel
by the BS. Here, the physical resource for the downlink
fast feedback channel is different from a physical
resource for a data channel, and also, the modulation pattern corresponds to feedback information. Thereafter, the transmitter 22 of the BS transmits the modulation
pattern to the MSS.
At the 'MSS, a receiver 13 receives the modulation pattern
transmitted from a base station (BS) . Here, the modulation pattern was established to the downlink fast feedback
channel at the controller 20 of the BS, and the modulation
pattern corresponds to feedback information. Upon receipt,
a controller 10 of the MSS detects the modulation pattern transmitted from the BS and determines which feedback
information is transmitted from the BS via the modulation
pattern. After determining the feedback information, a
transmitter 14 of the MSS transmits an uplink data, which
has been configured by using the feedback information, to
the BS.
It will be apparent to those skilled in the art that
various modifications and variations can be made in the
present invention without departing from the spirit or
scope of the inventions. Thus, it is intended that the present invention covers the modifications and variations
of this invention provided they come within the scope of
the appended claims and their equivalents.

Claims

[CLAIMS]
1. A method of transmitting information in a
wireless communication system, the method comprising:
receiving data from a mobile subscriber station
(MSS) via an uplink channel;
determining quality of the uplink channel based
on the received data by a base station (BS) ; and
transmitting a feedback information to the MSS,
wherein the feedback information is based on the
determined quality of the uplink channel.
2. The method of claim 1, wherein the feedback
information includes channel quality information (CQI) of
an uplink channel.
3. The method of claim 1, wherein the feedback
information includes weight values.
4. The method of claim 1, wherein the feedback
information includes a combination of channel quality
information (CQI) and weight values.
5. The method of claim 1, wherein the feedback information is transmitted via a downlink fast feedback
channel.
6. The method of claim 1, wherein the feedback
information is transmitted via a data burst .
7. The method of claim 1, wherein the feedback
information is transmitted via a Medium Access Channel
(MAC) message.
8. A method of receiving information in a wireless
communication system, the method comprising:
transmitting data to a base station (BS) via an
uplink channel; and
receiving a feedback information from the BS,
wherein the feedback information is based on quality of
the uplink channel, and wherein the quality of the uplink
channel is determined based on the transmitted data.
9. The method of claim 8, wherein the feedback
information includes channel quality information (CQI) of
an uplink channel.
10. The method of claim 8, wherein the feedback
information includes weight values.
11. The method of claim 8, wherein the feedback
information includes a combination of channel quality-
information (CQI) and weight values.
12. The method of claim 8, wherein the feedback
information is transmitted via a downlink fast feedback
channel.
13. The method of claim 8, wherein the feedback
information is transmitted via a data burst.
14. The method of claim 8, wherein the feedback
information is transmitted via a Medium Access Channel
(MAC) message.
15. A method of transmitting and receiving
information in a wireless communication system, the method
comprising:
transmitting data to a base station (BS) by a
mobile subscriber station (MSS) via an uplink channel; receiving the transmitted data from the MSS via
the uplink channel;
determining quality of the uplink channel based
on the received data by the BS;
transmitting a feedback information to the MSS
by the BS, wherein the feedback information is based on
the determined quality of the uplink channel; and
receiving the transmitted feedback information
from the BS.
16. The method of claim 15, wherein the feedback
information includes channel quality information (CQI) of
an uplink channel.
17. The method of claim 15, wherein the feedback
information includes weight values.
18. The method of claim 15, wherein the feedback
information includes a combination of channel quality
information (CQI) and weight values.
19. The method of claim 15, wherein the feedback
information is transmitted via a downlink fast feedback channel .
20. The method of claim 15, wherein the feedback
information is transmitted via a data burst.
21. The method of claim 15, wherein the feedback
information is transmitted via a Medium Access Channel
(MAC) message.
22. A wireless communication system for transmitting
information, the system comprising a base station (BS)
which includes:
a receiver for receiving data from a mobile
communication station (MSS) via an uplink channel;
a controller for determining quality of the
uplink channel based on the received data by the BS; and
a transmitter for transmitting a feedback
information to the MSS, wherein the feedback information
is based on the determined quality of the uplink channel.
23. A wireless communication system for receiving
information, the system comprising a mobile communication
station (MSS) which includes: a transmitter for transmitting data to a base
station (BS) via an uplink channel; and
a receiver for receiving a feedback information
from the BS, wherein the feedback information is based on
quality of the uplink channel, and wherein the quality of
the uplink channel is determined based on the transmitted
data.
24. A method of transmitting information in a
wireless communication system, the method comprising:
allocating a physical resource for a downlink
fast feedback channel by a base station (BS) , wherein the
physical resource for the downlink fast feedback channel
is different from a physical resource for a data channel;
establishing a modulation pattern to the
downlink fast feedback channel by the BS, wherein the
modulation pattern corresponds to feedback information;
and
transmitting the modulation pattern to a mobile
subscriber station (MSS) .
25. The method of claim 24, further comprising
receiving uplink data from the MSS, wherein the uplink data is configured by using feedback information.
26. The method of claim 24, wherein the modulation
pattern consists of sub-carriers.
27. The method of claim 24, wherein a location of
the downlink fast feedback channel is notified to the MSS
by the BS.
28. The method of claim 24, wherein a size of the
downlink fast feedback channel is notified to the MSS by
the BS.
29. The method of claim 24, wherein the modulation
patterns have orthogonal relationships with each other.
30. The method of claim 24, wherein the feedback
information includes channel quality information (CQI) .
31. The method of claim 24, wherein the feedback
information includes weight values.
32. The method of claim 24, wherein the feedback information includes a combination of channel quality
information (CQI) and weight values.
33. A method of receiving information in a wireless
communication system, the method comprising:
receiving and detecting a modulation pattern
transmitted from a base station (BS) , wherein the
modulation pattern is established to a downlink fast
feedback channel and wherein the modulation pattern
corresponds to feedback information;
determining which feedback information is
transmitted from the BS via the modulation pattern; and
transmitting uplink data, wherein the uplink
data is configured by using the feedback information.
34. The method of claim 33, wherein the feedback
information includes channel quality information (CQI) .
35. The method of claim 33, wherein the feedback
information includes weight values.
36. The method of claim 33, wherein the feedback
information includes a combination of channel quality information (CQI) and weight values.
37. A method of transmitting and receiving
information in a wireless communication system, the method
comprising: allocating a physical resource for a downlink
fast feedback channel by a base station (BS) , wherein the
physical resource for the downlink fast feedback channel
is different from a physical resource for a data channel;
establishing a modulation pattern to the
downlink fast feedback channel by the BS, wherein the
modulation pattern corresponds to feedback information;
transmitting the modulation pattern to a mobile
subscriber station (MSS) ;
receiving and detecting a modulation pattern
transmitted from a base station (BS) , wherein the
modulation pattern is established to a downlink fast
feedback channel and wherein the modulation pattern
corresponds to feedback information;
determining which feedback information is
transmitted from the BS via the modulation pattern; and
transmitting uplink data, wherein the uplink
data is configured by using the feedback information.
38. The method of claim 37, wherein the modulation
pattern consists of sub-carriers.
39. The method of claim 37, wherein a location of
the downlink fast feedback channel is notified to the MSS
by the BS.
40. The method of claim 37, wherein a size of the
downlink fast feedback channel is notified to the MSS by
the BS.
41. The method of claim 37, wherein the modulation
patterns have orthogonal relationships with each other.
42. The method of claim 37, wherein the feedback
information includes channel quality information (CQI) .
43. The method of claim 37, wherein the feedback
information includes weight values.
44. The method of claim 37, wherein the feedback
information includes a combination of channel quality information (CQI) and weight values.
45. A wireless communication system for transmitting
information, the system comprising a base station (BS)
which includes:
a controller for allocating a physical resource
for a downlink fast feedback channel by a base station
(BS) and establishing a modulation pattern to the downlink
fast feedback channel by the BS, wherein the physical
resource for the downlink fast feedback channel is
different from a physical resource for a data channel, and
wherein the modulation pattern corresponds to feedback
information; and
a transmitter for transmitting the modulation
pattern to a mobile subscriber station (MSS) .
46. A wireless communication system for receiving
information, the system comprising a mobile subscriber
station (MSS) which includes:
a receiver for receiving a modulation pattern
transmitted from a base station (BS) , wherein the
modulation pattern is established to a downlink fast
feedback channel and wherein the modulation pattern corresponds to feedback information;
a controller for detecting the modulation
pattern transmitted from the BS and determining which
feedback information is transmitted from the BS via the
modulation pattern; and
a transmitter for transmitting uplink data,
wherein the uplink data is configured by using the
feedback information.
PCT/KR2005/002703 2004-08-17 2005-08-17 A method for establishing fast feedback channel and transmitting information in a wireless communication system WO2006019263A2 (en)

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EP05776004.3A EP1790088B1 (en) 2004-08-17 2005-08-17 A method for establishing fast feedback channel and transmitting information in a wireless communication system
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US20080119213A1 (en) 2008-05-22
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