U.S. patent application number 12/766107 was filed with the patent office on 2010-10-28 for feedback channel release.
Invention is credited to Guangjie Li, Hongmei Sun, Hujun Yin, Yuan Zhu.
Application Number | 20100272047 12/766107 |
Document ID | / |
Family ID | 42992059 |
Filed Date | 2010-10-28 |
United States Patent
Application |
20100272047 |
Kind Code |
A1 |
Zhu; Yuan ; et al. |
October 28, 2010 |
FEEDBACK CHANNEL RELEASE
Abstract
Briefly, in accordance with one or more embodiments, a
communication link is established between a base station and a
mobile station. The base station transmits a feedback allocation to
the mobile station for the allocation of the resources of a
feedback channel. If the feedback allocation is to be terminated,
the base station transmits a feedback deallocation to the mobile
station. If the feedback deallocation is successful, the mobile
station transmits a deallocation confirmation to the base station
to confirm receipt of the feedback deallocation.
Inventors: |
Zhu; Yuan; (Beijing, CN)
; Sun; Hongmei; (Beijing, CN) ; Li; Guangjie;
(Beijing, CN) ; Yin; Hujun; (Saratoga,
CA) |
Correspondence
Address: |
COOL PATENT, P.C.;c/o CPA Global
P.O. BOX 52050
MINNEAPOLIS
MN
55402
US
|
Family ID: |
42992059 |
Appl. No.: |
12/766107 |
Filed: |
April 23, 2010 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
|
61173204 |
Apr 28, 2009 |
|
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Current U.S.
Class: |
370/329 |
Current CPC
Class: |
H04L 5/0053 20130101;
H04L 1/1835 20130101; H04W 72/04 20130101; H04L 1/1812 20130101;
H04L 5/0055 20130101 |
Class at
Publication: |
370/329 |
International
Class: |
H04W 72/00 20090101
H04W072/00 |
Claims
1. A method, comprising: establishing a communication link with a
mobile station; transmitting a feedback allocation to the mobile
station; if the feedback allocation is to be terminated,
transmitting a feedback deallocation to the mobile station; and if
the feedback deallocation is successful, receiving a deallocation
confirmation from the mobile station.
2. A method as claimed in claim 1, wherein the feedback allocation
comprises a feedback allocation advanced map (A-MAP) information
element (IE).
3. A method as claimed in claim 1, wherein the feedback
deallocation comprises a feedback deallocation advanced map (A-MAP)
information element (IE).
4. A method as claimed in claim 1, wherein the feedback allocation
comprises a short-term feedback period or a long-term feedback
period.
5. A method as claimed in claim 1, wherein the feedback allocation
comprises a predetermined period, and said transmitting a feedback
deallocation to the mobile station occurs if the feedback
allocation is to be terminated prior to expiration of the
predetermined period.
6. A method as claimed in claim 1, wherein the feedback
deallocation is transmitted one or more additional times in the
event a deallocation confirmation is not received from the mobile
station.
7. A method as claimed in claim 1, wherein the deallocation
confirmation is transmitted as a code word in a primary fast
feedback channel.
8. A method, comprising: establishing a communication link with a
base station; receiving a feedback allocation from the base
station; if the feedback allocation is to be terminated, receiving
a feedback deallocation from the base station; and transmitting a
deallocation confirmation to the base station.
9. A method as claimed in claim 8, wherein the feedback allocation
comprises a feedback allocation advanced map (A-MAP) information
element (IE).
10. A method as claimed in claim 8, wherein the feedback
deallocation comprises a feedback deallocation advanced map (A-MAP)
information element (IE).
11. A method as claimed in claim 8, wherein the feedback allocation
comprises a short-term feedback period or a long-term feedback
period.
12. A method as claimed in claim 8, wherein the feedback allocation
comprises a predetermined period, and said receiving a feedback
deallocation from the base station occurs if the feedback
allocation is to be terminated prior to expiration of the
predetermined period.
13. A method as claimed in claim 8, wherein the deallocation
confirmation is transmitted one or more additional times in the
event one or more additional feedback deallocation messages are
received from the base station.
14. A method as claimed in claim 8, wherein the deallocation
confirmation comprises a code word in a primary fast feedback
channel.
15. A base station, comprising: a transceiver having an antenna
coupled to the transceiver; and a processor couple to the
transceiver, wherein the processor is configured to cause the
transceiver to: establish a communication link with a mobile
station; transmit a feedback allocation to the mobile station;
transmit a feedback deallocation to the mobile station if the
feedback allocation is to be terminated; and receive a deallocation
confirmation from the mobile station if the feedback deallocation
is successful.
16. A base station as claimed in claim 15, wherein the feedback
allocation comprises a predetermined period, and wherein the
processor is further configured to cause the transceiver to
transmit a feedback deallocation to the mobile station if the
feedback allocation is to be terminated prior to expiration of the
predetermined period.
17. A base station as claimed in claim 15, wherein the processor is
further configured to cause the transceiver to transmit the
feedback deallocation one or more additional times in the event a
deallocation confirmation is not received from the mobile
station.
18. A base station as claimed in claim 15, wherein the deallocation
confirmation is transmitted as a code word in a primary fast
feedback channel.
19. A mobile station, comprising: a transceiver having an antenna
coupled to the transceiver; and a processor couple to the
transceiver, wherein the processor is configured to cause the
transceiver to: establish a communication link with a base station;
receive a feedback allocation from the base station; receive a
feedback deallocation from the base station if the feedback
allocation is to be terminated; and transmit a deallocation
confirmation to the base station.
20. A method as claimed in claim 8, wherein the feedback allocation
comprises a predetermined period, and said receiving a feedback
deallocation from the base station occurs if the feedback
allocation is to be terminated prior to expiration of the
predetermined period.
21. A method as claimed in claim 8, wherein the deallocation
confirmation is transmitted one or more additional times in the
event one or more additional feedback deallocation messages are
received from the base station.
22. A method as claimed in claim 8, wherein the deallocation
confirmation comprises a code word in a primary fast feedback
channel.
23. An article of manufacture comprising a machine readable medium
having instruction stored thereon that, if executed by a processor,
result in: establishing a communication link with a mobile station;
transmitting a feedback allocation to the mobile station; if the
feedback allocation is to be terminated, transmitting a feedback
deallocation to the mobile station; and if the feedback
deallocation is successful, receiving a deallocation confirmation
from the mobile station.
24. An article of manufacture as claimed in claim 23, wherein the
feedback allocation comprises a predetermined period, and said
transmitting a feedback deallocation to the mobile station occurs
if the feedback allocation is to be terminated prior to expiration
of the predetermined period.
25. An article of manufacture as claimed in claim 23, wherein the
feedback deallocation is transmitted one or more additional times
in the event a deallocation confirmation is not received from the
mobile station.
26. An article of manufacture as claimed in claim 23, wherein the
deallocation confirmation is transmitted as a code word in a
primary fast feedback channel.
27. An article of manufacture comprising a machine readable medium
having instruction stored thereon that, if executed by a processor,
result in: establishing a communication link with a base station;
receiving a feedback allocation from the base station; if the
feedback allocation is to be terminated, receiving a feedback
deallocation from the base station; and transmitting a deallocation
confirmation to the base station.
28. An article of manufacture as claimed in claim 27, wherein the
feedback allocation comprises a predetermined period, and said
receiving a feedback deallocation from the base station occurs if
the feedback allocation is to be terminated prior to expiration of
the predetermined period.
29. An article of manufacture as claimed in claim 27, wherein the
deallocation confirmation is transmitted one or more additional
times in the event one or more additional feedback deallocation
messages are received from the base station.
30. A method as claimed in claim 27, wherein the deallocation
confirmation comprises a code word in a primary fast feedback
channel.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] The present application claims the benefit of U.S.
Application No. 61/173,204 filed Apr. 28, 2009 in the name of
inventors Yuan Zhu et al. Said Application No. 61/173,204 is hereby
incorporated herein by reference in its entirety.
BACKGROUND
[0002] In wireless mobile broadband communication systems, uplink
feedback channel may be used to assist closed loop operation. For
example, in systems compliant with an Institute of Electrical and
Electronics Engineers (IEEE) 802.16m standard, two kinds of
feedback channels are defined to assist closed loop multiple-input
and multiple-output (MIMO) operations. One type of channel is
referred to as a primary fast feedback channel, and the other type
of channel is referred to as a secondary fast feedback channel. The
primary fast feedback channel utilizes sequence modulation to
convey 4-6 bits in a 6.times.6 uplink control distributed resource
unit (DRU). The secondary fast feedback channel utilizes coherent
detection to convey 7-24 bits in a 6.times.6 DRU. The primary fast
feedback channel is more robust than the secondary fast feedback
channel, but on the other hand the secondary fast feedback channel
has higher throughput than the primary fast feedback channel. A
feedback advanced map (A-MAP) allocation information element (IE)
is utilized to allocate and deallocate a feedback channel for a
specific mobile station (MS). In the case wherein a periodical
allocation is implemented, the base station (BS) specifies a
transmission period and a transmit duration. With limited signaling
bit length, the transmit duration is normally represented
exponentially such as 4.sup.p periods. If 3 bits are used to
represent p, then the transmit duration may be from 1 period to
16384 frames.
[0003] Deallocation may be involved if the base station sees there
is no need for the mobile station to transmit feedback according to
previous allocation. An example scenario is when a user canceled
downloading a large sized file. If the allocation is very long, and
there is a 1% chance the mobile stations might miss the
deallocation A-MAP IE, there is a chance that the mobile station
will continue transmitting on the deallocated feedback channels
without this being known by the base station. In such a situation,
unnecessary interference may be generated and causing collisions in
the deallocated feedback channel. From the perspective of the base
station, the lost deallocation A-MAP IE may be detected with
collision detection on the deallocated feedback channel. However,
this relies on a smart base station implementation, and the
detection reliability needs to be guaranteed for multiple periods.
In a worst case scenario, the base station may not perform
collision detection, and the mobile station will continue sending
on a deallocated feedback channel until the expiration of the
allocation period.
DESCRIPTION OF THE DRAWING FIGURES
[0004] Claimed subject matter is particularly pointed out and
distinctly claimed in the concluding portion of the specification.
However, such subject matter may be understood by reference to the
following detailed description when read with the accompanying
drawings in which:
[0005] FIG. 1 is a block diagram of a channel feedback system
capable of implementing feedback channel release for a wireless
network in accordance with one or more embodiments;
[0006] FIG. 2 is a block diagram of a wireless wide area network
utilizing a channel feedback system in accordance with one or more
embodiments;
[0007] FIG. 3 is a block diagram of a feedback deallocation release
confirmation procedure in accordance with one or more
embodiments;
[0008] FIG. 4 is a flow diagram of a method for implementing
feedback channel release in accordance with one or more
embodiments; and
[0009] FIG. 5 is a block diagram of an information handling system
capable of implementing feedback channel release in accordance with
one or more embodiments.
[0010] It will be appreciated that for simplicity and/or clarity of
illustration, elements illustrated in the figures have not
necessarily been drawn to scale. For example, the dimensions of
some of the elements may be exaggerated relative to other elements
for clarity. Further, if considered appropriate, reference numerals
have been repeated among the figures to indicate corresponding
and/or analogous elements.
DETAILED DESCRIPTION
[0011] In the following detailed description, numerous specific
details are set forth to provide a thorough understanding of
claimed subject matter. However, it will be understood by those
skilled in the art that claimed subject matter may be practiced
without these specific details. In other instances, well-known
methods, procedures, components and/or circuits have not been
described in detail.
[0012] In the following description and/or claims, the terms
coupled and/or connected, along with their derivatives, may be
used. In particular embodiments, connected may be used to indicate
that two or more elements are in direct physical and/or electrical
contact with each other. Coupled may mean that two or more elements
are in direct physical and/or electrical contact. However, coupled
may also mean that two or more elements may not be in direct
contact with each other, but yet may still cooperate and/or
interact with each other. For example, "coupled" may mean that two
or more elements do not contact each other but are indirectly
joined together via another element or intermediate elements.
Finally, the terms "on," "overlying," and "over" may be used in the
following description and claims. "On," "overlying," and "over" may
be used to indicate that two or more elements are in direct
physical contact with each other. However, "over" may also mean
that two or more elements are not in direct contact with each
other. For example, "over" may mean that one element is above
another element but not contact each other and may have another
element or elements in between the two elements. Furthermore, the
term "and/or" may mean "and", it may mean "or", it may mean
"exclusive-or", it may mean "one", it may mean "some, but not all",
it may mean "neither", and/or it may mean "both", although the
scope of claimed subject matter is not limited in this respect. In
the following description and/or claims, the terms "comprise" and
"include," along with their derivatives, may be used and are
intended as synonyms for each other.
[0013] Referring now to FIG. 1, a block diagram of a channel
feedback system for a wireless network capable of implementing
feedback channel release in accordance with one or more embodiments
will be discussed. As shown in FIG. 1, a channel feedback system
100 may comprise a base station 110 having one or more antennas 112
communicating with a mobile station 114 having one or more antennas
116. In one or more embodiments, base station 110 may transmit data
packets via a downlink (DL) channel 118 to mobile station 114.
Feedback may be provided from mobile station 114 to base station
110 in a feedback arrangement comprising a two-level adaptive
feedback framework comprising a primary uplink (UL) fast feedback
channel 120 and a secondary uplink fast feedback channel 122.
Primary UL feedback channel 120 may provide wideband channel
quality indicator (CQI) reports with robust data rate from mobile
station 114 to transmitter regarding downlink channel 118.
Secondary UL feedback channel 122 may provide sub-band CQI reports
from mobile station 114 to base station 110 using an adaptive
transmission rate. Secondary UL fast feedback channel 122 may
utilize link adaptation with event-driven transmission in order to
enhance the transmission efficiency with a reduced overhead. Such a
two-channel feedback system 100 as shown in FIG. 1 provides
flexibility for an independent fast feedback channel design in
order to optimize the performance of each channel. For example, the
two-channel feedback system may achieve an optimal or a nearly
optimal performance under different permutation modes, although the
scope of the claimed subject matter is not limited in this
respect.
[0014] In one or more embodiments, primary UL feedback channel 120
may be referred to as a primary CQI channel (PCQICH) and secondary
feedback channel 122 may be referred to as a secondary CQI channel
(SCQICH). Optimized Bose and Ray-Chaudhuri (BCH) codes may be
utilized used for both primary (PCQICH) fast feedback channel 120
and/or secondary (SCQICH) fast feedback channel 122 having a
relatively simplified design and reduced complexity in order to fit
the feedback information into different tile sizes. In one or more
embodiments, primary fast feedback channel 120 may utilize
semi-orthogonal sequences, for example of length 12, to support up
to 6 information bits with optimized performance, and furthermore
may utilize larger diversity order. Mobile station 114 may utilize
a non-coherent design to support fast feedback channel transmission
with non-coherent detection in high speeds such as when speed is
larger than 120 kilometers per hour (kmph), although the scope of
the claimed subject matter is not limited in this respect.
[0015] In one or more embodiments, primary CQI channel 120 may
support lower rate, less frequent, periodic CQI feedback
transmission from mobile station 114 to base station 110. Primary
CQI channel 120 may transmit average CQI and/or multiple-input,
multiple-output (MIMO) feedback information and to provide reliable
basic connections from mobile station 114 to base station 110.
Primary CQI channel 120 may be available to all users who need to
feedback CQI in the uplink. For example, the base station 110 may
allocate resources for primary fast feedback channel 120 and
specify the feedback frequency based on the channel variation
characteristics for each individual user, referred to as a
subscriber station or mobile station 114, embodied as mobile
station 114. The resource allocation information may be sent to the
mobile station 114 to regulate its CQI feedback behavior.
[0016] In one or more embodiments, the secondary fast feedback
channel 122 may support more advanced features than the primary
fast feedback channel 120, for example multiple-input,
multiple-output (MIMO), fractional frequency reuse (FFR), frequency
selective scheduling (FSS), and so on, with greater efficiency and
is used when there is data to be transmitted. Furthermore,
secondary fast feedback channel 122 may provide CQI feedback more
frequently and/or with finer granularity than primary fast feedback
channel 120. That is, secondary fast feedback channel 122 may
support a higher payload feedback of narrow band CQI and MIMO
feedback information, which may include MIMO effective
signal-to-interference and noise ratio (SINR) per codeword,
transmission rank, and pre-coding matrix index (PMI), and so on, on
demand, and the transmission may be event driven. To ensure robust
transmission while maximizing throughput of secondary fast feedback
channel 122, link adaptation may be utilized on secondary fast
feedback channel 122, and which may be utilized based at least in
part on user location and/or channel condition to increase feedback
efficiency. In such an arrangement, center users may take advantage
of their relatively higher SINR and transmit CQIs at higher rates
with an increased efficiency. As a result, secondary fast feedback
channel 122 may cover users with localized resource allocation via
downlink channel 118 that involves feeding back more CQI to support
features such as FSS, MIMO, and so on, while users with very poor
channel quality may not achieve meaningful gain feeding back more
CQI using secondary fast feedback channel 122. Per a request from a
subscriber station, the base station 110 may decide whether to
allocate secondary fast feedback channel 122, when to allocate
secondary fast feedback channel 122, the amount of resources
involved and the corresponding index, transmission frequency, rate,
and so on, and relay such information to the mobile station 114.
Further details of channel feedback system 100 are discussed,
below. An example network implementing channel feedback system 100
is shown in and described with respect to FIG. 2, below.
[0017] Referring now to FIG. 2, a block diagram of a wireless wide
area network utilizing a channel feedback system implementing
feedback channel release in accordance with one or more embodiments
will be discussed. As shown in FIG. 2, network 200 may be an
internet protocol (IP) type network comprising an internet 210 type
network or the like that is capable of supporting mobile wireless
access and/or fixed wireless access to internet 210. In one or more
embodiments, network 200 may be in compliance with a Worldwide
Interoperability for Microwave Access (WiMAX) standard or future
generations of WiMAX, and in one particular embodiment may be in
compliance with an Institute for Electrical and Electronics
Engineers 802.16m standard (IEEE 802.16m). In one or more
alternative embodiments network 200 may be in compliance with a
Third Generation Partnership Project Long Term Evolution (3GPP LTE)
or a 3GPP2 Air Interface Evolution (3GPP2 AIE) standard. In
general, network 200 may comprise any type of orthogonal frequency
division multiple access (OFDMA) based wireless network, and the
scope of the claimed subject matter is not limited in these
respects. As an example of mobile wireless access, access service
network (ASN) 212 is capable of coupling with base station (BS) 214
to provide wireless communication between subscriber station (SS)
216 and internet 210. Subscriber station 216 may comprise a mobile
type device or information handling system capable of wirelessly
communicating via network 200, for example a notebook type
computer, a cellular telephone, a personal digital assistant, or
the like. ASN 212 may implement profiles that are capable of
defining the mapping of network functions to one or more physical
entities on network 200. Base station 214 may comprise radio
equipment to provide radio-frequency (RF) communication with
subscriber station 216, and may comprise, for example, the physical
layer (PHY) and media access control (MAC) layer equipment in
compliance with an IEEE 802.16m type standard. Base station 214 may
further comprise an IP backplane to couple to internet 210 via ASN
212, although the scope of the claimed subject matter is not
limited in these respects.
[0018] Network 200 may further comprise a visited connectivity
service network (CSN) 224 capable of providing one or more network
functions including but not limited to proxy and/or relay type
functions, for example authentication, authorization and accounting
(AAA) functions, dynamic host configuration protocol (DHCP)
functions, or domain name service controls or the like, domain
gateways such as public switched telephone network (PSTN) gateways
or voice over internet protocol (VoIP) gateways, and/or internet
protocol (IP) type server functions, or the like. However, these
are merely example of the types of functions that are capable of
being provided by visited CSN or home CSN 226, and the scope of the
claimed subject matter is not limited in these respects. Visited
CSN 224 may be referred to as a visited CSN in the case for example
where visited CSN 224 is not part of the regular service provider
of subscriber station 216, for example where subscriber station 216
is roaming away from its home CSN such as home CSN 226, or for
example where network 200 is part of the regular service provider
of subscriber station but where network 200 may be in another
location or state that is not the main or home location of
subscriber station 216. In a fixed wireless arrangement, WiMAX type
customer premises equipment (CPE) 222 may be located in a home or
business to provide home or business customer broadband access to
internet 210 via base station 220, ASN 218, and home CSN 226 in a
manner similar to access by subscriber station 216 via base station
214, ASN 212, and visited CSN 224, a difference being that WiMAX
CPE 222 is generally disposed in a stationary location, although it
may be moved to different locations as needed, whereas subscriber
station may be utilized at one or more locations if subscriber
station 216 is within range of base station 214 for example. In
accordance with one or more embodiments, operation support system
(OSS) 228 may be part of network 200 to provide management
functions for network 200 and to provide interfaces between
functional entities of network 200. Network 200 of FIG. 2 is merely
one type of wireless network showing a certain number of the
components of network 200, however the scope of the claimed subject
matter is not limited in these respects.
[0019] Referring now to FIG. 3, a block diagram of a feedback
deallocation release confirmation procedure in accordance with one
or more embodiments will be discussed. The arrangement shown in
FIG. 3 illustrates a general description of a feedback deallocation
confirmation procedure in accordance with one or more embodiments.
In one or more embodiments, base station 110 transmits a feedback
deallocation advanced map (A-MAP) information element (IE) 310 to
mobile station 114, for example via downlink channel 118 as shown
in FIG. 1. The deallocation A-MAP IE transmitted by base station
110 to mobile station 114 directs mobile station 114 to deallocate
utilization of the feedback channels, for example primary uplink
feedback channel 120 and/or secondary uplink feedback channel 122
as shown in FIG. 1. In response to receiving feedback deallocation
A-MAP IE 310 from base station 110, mobile station 114 confirms the
receipt of the feedback deallocation A-MAP IE 310 by transmitting a
deallocation confirmation 312 to base station 110 so that base
station 110 knows whether the feedback channel has been properly
deallocated. Thus, in one or more embodiments, after sending a
feedback deallocation A-MAP IE 310 to mobile station 114, base
station 110 will expect to receive a deallocation conformation 312
from mobile station. In the event a deallocation confirmation 312
is received, the base station may then reallocate the feedback
channel to another mobile station. However, in the event case no
deallocation confirmation 312 is received by the base station 110,
the base station optionally may resend one or more feedback
deallocation A-MAP IEs 310 until a deallocation confirmation 312 is
received, or until a time out is reached.
[0020] In one or more embodiments, the deallocation confirmation
312 sent from mobile station 114 to base station 110 may be defined
utilizing one code word in the primary fast feedback channel 120.
However, other special formats for deallocation confirmation 312
may be utilized, and the scope of the claimed subject matter is not
limited in this respect. In one or more embodiments, deallocation
confirmation 312 may be send as one code word in primary fast
feedback channel 120 because primary fast feedback channel 120 is
more robust than secondary fast feedback channel 122, and in one or
more embodiments the deallocation confirmation 312 may be even more
robust than a normal primary fast feedback channel transmission
because the detection of the deallocation confirmation 312 may
simply involve judging if the special deallocation confirmation 312
code word is sent or if some other signal is sent.
[0021] An example system for feedback channel deallocation is shown
in Table 1, below.
TABLE-US-00001 TABLE 1 Feedback Allocation A-MAP IE Syntax Size
(bit) Notes Feedback_Allocation_A- -- -- MAP_IE( ) { A-MAP IE Type
4 Feedback Allocation A-MAP IE Channel Index 6 Feedback channel
index within the uplink (UL) fast feedback control resource region
(Dependent on L.sub.FB,FPi defined in IEEE 802.16m/D5 16.3.8.3.3.2)
Short-term feedback period 3 Feedback is transmitted on the
feedback (p) channel (FBCH) every 2.sup.p frames Long-term feedback
Period 2 Long-term feedback is transmitted on the (q) FBCH every
2.sup.q short-term feedback opportunities. If q = 0b00, either the
short-term or the long-term feedback shall be reported by the
advanced mobile station (AMS), depending on the feedback formats
defined in IEEE 802.16m/D5 16.3.9.3.1.5 Frame_number 2 The AMS
starts reporting at the frame which number in the superframe is
equal to Frame_number. If the current frame is specified, the AMS
starts reporting in four frames. Frames are numbered from 0 to 3 in
the superframe. Multiple-input and multiple-output (MIMO) feedback
reported by an AMS in frame N pertains to measurements performed at
least up to frame N - 1. The first MIMO feedback report following
the Feedback Allocation A-MAP IE as per the "Frame_number" may
contain invalid MIMO feedback information if the MIMO feedback is
sent in the frame immediately following the frame in which the
Feedback Allocation A-MAP IE was received. Subframe index 3
Indicates the UL advanced air interface (AAI) subframe index in the
UL portion of the frame Allocation Duration (d) 3 An FBCH is
transmitted on the FBCH channels indexed by Channel Index for 8
.times. 2.sup.d frames. If d = 0b000, the FBCH is deallocated. If d
= 0b111, the AMS reports until the advanced base station (ABS)
command for the AMS to stop. ACK allocation flag 1 Indicates if one
hybrid automatic repeat request (HARQ) feedback channel is
allocated to acknowledge the successful detection of this IE. if
(ACK allocation flag == 0b1) {
As shown in Table 1, the feedback allocation A-MAP IE arrangement
includes an acknowledgement (ACK) allocation flag for example as
provided in a hybrid automatic repeat request (HARQ) type system.
If the ACK allocation flag is equal to 1, then a 6 bit HARQ
feedback allocation (HFA) indicates the HARQ index. Mobile station
114 utilizes the indicated HARQ feedback channel to transmit the
successful reception of the feedback deallocation A-MAP IE 312 to
base station 110. An example method for implementing feedback
channel release is shown in and described with respect to FIG. 4,
below.
[0022] Referring now to FIG. 4, a flow diagram of a method for
implementing feedback channel release in accordance with one or
more embodiments will be discussed. Although FIG. 4 shows one
example order of method 400, various other orders may likewise be
implemented, including more or fewer blocks than shown in FIG. 4,
and the scope of the claimed subject matter is not limited in these
respects. As shown in FIG. 4, a communication link may be
established between the base station 110 and a mobile station 114
at block 410. The base station 110 transmits a feedback allocation
A-MAP IE 310 to the mobile station 114 at block 412 to allocate a
feedback channel to be utilized by the mobile station 114 for
various communication, for example to transmit a channel quality
indicator (CQI), for various hybrid automatic repeat request (HARM)
messages, and/or for a other feedback transmissions to support
multiple-input and multiple-output (MIMO) communication. In one or
more embodiments, the mobile station 114 send feedback to base
station 110 at block 414 in primary fast feedback channel 120
and/or secondary fast feedback channel 122 according to the
feedback allocation A-MAP IE 310 transmitted to the mobile station
114. In one or more embodiments, the feedback allocation includes
an allocation period during which mobile station 114 may utilize
the allocated feedback channel, such as a short-term feedback
period (p) or a long-term feedback period (q). A determination may
be made at block 416 whether the feedback allocation should be
terminated, for example prior to the end of the allocated feedback
period. If no determination is made to terminate the allocation,
the mobile station 114 may continue to send feedback to the base
station 110 based on the feedback allocation. However, in the event
a determination is made that the feedback allocation should be
terminated, the base station 110 transmits a feedback deallocation
A-MAP IE 310 at block 418 to mobile station 114. In response to
receiving the feedback deallocation A-MAP IE 310, the mobile
station 114 transmits a deallocation confirmation 312 at block 420
to base station 110. A determination may be made at block 422 if
the deallocation confirmation 312 is received by base station 110.
If the base station 110 did not receive the deallocation
confirmation 312 from the mobile station 114, the base station 110
optionally may retransmit the feedback deallocation A-MAP IE 310 at
block 418 one or more additional times, and/or mobile station 114
optionally may retransmit the deallocation confirmation 312 to base
station 110 one or more additional times. In the event that base
station 110 receives the deallocation confirmation 422, or at the
end of a predetermined timeout period or a after predetermined
number of retransmissions, the base station 110 may reallocate the
feedback channel resources to another mobile station at block 424.
Method 400 may then operate for feedback channel allocation and/or
deallocation for the other mobile station.
[0023] Referring now to FIG. 5, a block diagram of an information
handling system capable of implementing feedback channel release in
accordance with one or more embodiments. Information handling
system 500 of FIG. 5 may tangibly embody one or more of any of the
elements of channel feedback system 100 as shown in and described
with respect to FIG. 1, and/or any network element of network 200
of FIG. 2. For example, information handling system 500 may
represent the hardware of base station 110 and/or mobile station
114, with greater or fewer components depending on the hardware
specifications of the particular device or network element.
Although information handling system 500 represents one example of
several types of computing platforms, information handling system
500 may include more or fewer elements and/or different
arrangements of elements than shown in FIG. 5, and the scope of the
claimed subject matter is not limited in these respects.
[0024] Information handling system 500 may comprise one or more
processors such as processor 510 and/or processor 512, which may
comprise one or more processing cores. One or more of processor 510
and/or processor 512 may couple to one or more memories 516 and/or
518 via memory bridge 514, which may be disposed external to
processors 510 and/or 512, or alternatively at least partially
disposed within one or more of processors 510 and/or 512. Memory
516 and/or memory 518 may comprise various types of semiconductor
based memory, for example volatile type memory and/or non-volatile
type memory. Memory bridge 514 may couple to a graphics system 520
to drive a display device (not shown) coupled to information
handling system 500.
[0025] Information handling system 500 may further comprise
input/output (I/O) bridge 522 to couple to various types of I/O
systems. I/O system 524 may comprise, for example, a universal
serial bus (USB) type system, an IEEE 1394 type system, or the
like, to couple one or more peripheral devices to information
handling system 500. Bus system 526 may comprise one or more bus
systems such as a peripheral component interconnect (PCI) express
type bus or the like, to connect one or more peripheral devices to
information handling system 500. A hard disk drive (HDD) controller
system 528 may couple one or more hard disk drives or the like to
information handling system, for example Serial ATA type drives or
the like, or alternatively a semiconductor based drive comprising
flash memory, phase change, and/or chalcogenide type memory or the
like. Switch 530 may be utilized to couple one or more switched
devices to I/O bridge 522, for example Gigabit Ethernet type
devices or the like. Furthermore, as shown in FIG. 5, information
handling system 500 may include a radio-frequency (RF) block 532
comprising RF circuits and devices for wireless communication with
other wireless communication devices and/or via wireless networks
such as channel feedback system 100 of FIG. 1, for example where
information handling system 500 embodies base station 110 and/or
mobile station 114, although the scope of the claimed subject
matter is not limited in this respect. Furthermore, at least some
portion of base station 110 or mobile station 114 may be
implemented by processor 510, for example the digital functions of
base station 110 or mobile station 114 which may include processing
of the baseband and/or quadrature signals, although the scope of
the claimed subject matter is not limited in this respect.
[0026] Although the claimed subject matter has been described with
a certain degree of particularity, it should be recognized that
elements thereof may be altered by persons skilled in the art
without departing from the spirit and/or scope of claimed subject
matter. It is believed that the subject matter pertaining to
feedback channel release and/or many of its attendant utilities
will be understood by the forgoing description, and it will be
apparent that various changes may be made in the form, construction
and/or arrangement of the components thereof without departing from
the scope and/or spirit of the claimed subject matter or without
sacrificing all of its material advantages, the form herein before
described being merely an explanatory embodiment thereof, and/or
further without providing substantial change thereto. It is the
intention of the claims to encompass and/or include such
changes.
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