U.S. patent application number 12/091651 was filed with the patent office on 2009-06-25 for method and apparatus for processing in a connected state by an access terminal and access network in wireless communication systems.
This patent application is currently assigned to QUALCOMM INCORPORATED. Invention is credited to Rajat Prakash.
Application Number | 20090164658 12/091651 |
Document ID | / |
Family ID | 37716007 |
Filed Date | 2009-06-25 |
United States Patent
Application |
20090164658 |
Kind Code |
A1 |
Prakash; Rajat |
June 25, 2009 |
METHOD AND APPARATUS FOR PROCESSING IN A CONNECTED STATE BY AN
ACCESS TERMINAL AND ACCESS NETWORK IN WIRELESS COMMUNICATION
SYSTEMS
Abstract
A method and apparatus for processing on entering a Connected
State by an access terminal and an access network is provided
comprising issuing a ConnectedState.Activate command and an
ActiveSetManagement.Open command, determining whether protocol
receives an indication and determining whether protocol receives a
Redirect message.
Inventors: |
Prakash; Rajat; (La Jolla,
CA) |
Correspondence
Address: |
TUROCY & WATSON, LLP
127 Public Square, 57th Floor, Key Tower
Cleveland
OH
44114
US
|
Assignee: |
QUALCOMM INCORPORATED
San Diego
CA
|
Family ID: |
37716007 |
Appl. No.: |
12/091651 |
Filed: |
October 27, 2006 |
PCT Filed: |
October 27, 2006 |
PCT NO: |
PCT/US06/42010 |
371 Date: |
October 15, 2008 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
|
60731126 |
Oct 27, 2005 |
|
|
|
Current U.S.
Class: |
709/235 |
Current CPC
Class: |
H04L 1/0675 20130101;
Y02D 70/1224 20180101; H04L 1/0003 20130101; H04L 1/0026 20130101;
Y02D 30/32 20180101; H04W 24/10 20130101; H04W 52/0235 20130101;
Y02D 30/00 20180101; Y02D 70/1242 20180101; Y02D 70/146 20180101;
H04L 41/0803 20130101; Y02D 70/144 20180101; H04L 1/0028 20130101;
H04W 88/02 20130101; Y02D 70/162 20180101; H04L 41/0869 20130101;
Y02D 70/142 20180101; H04L 41/083 20130101; Y02D 30/70 20200801;
H04B 17/382 20150115; H04B 17/318 20150115; H04L 27/2647
20130101 |
Class at
Publication: |
709/235 |
International
Class: |
G06F 15/173 20060101
G06F015/173 |
Claims
1. A method of processing on entering a Connected State by an
access terminal, characterized in that: issuing a
ConnectedStateActivate command and issuing an
ActiveSetManagement.Open command; determining whether a
ConnectedState.ConnectionClosed, an OverheadMessages.Supervision
Failed, a ControlChannelMAC.SupervisionFailed, an
ActiveSetManagement.AssignmentRejected, or a
ForwardTrafficChannelMAC.SupervisionFailed indication is received;
determining whether protocol receives a Redirect message; issuing
an ActiveSetManagement.Close command, performing a clean up
procedure and performing transition to idle state on receiving at
least one of the ConnectedState.ConnectionClosed, the
OverheadMessages.Supervision Failed, the
ControlChannelMAC.SupervisionFailed, the
ActiveSetManagement.AssignmentRejected, or the
ForwardTrafficChannelMAC.SupervisionFailed indication.
2. The method as claimed in claim 1, characterized in that issuing
an ActiveSetManagement.Deactivate command, issuing an
OverheadMessages.Deactivate command, issuing a
ForwardTrafficChannel.Deactivate command, issuing a
SharedSignallingMAC.Deactivate command, performing a cleanup
procedure and performing transition to initialization state on
receiving a Redirect message.
3. The method as claimed in claim any of the preceding claims,
characterized in that the step of performing the cleanup procedure
comprises issuing a ReverseTrafficChannel.Deactivate command,
issuing a ReverseControlChannelMAC.Deactivate command, issuing an
ActiveSetManagement.Close and issuing a ConnectedState.Deactivate
command.
4. A computer-readable medium including instruction stored thereon,
characterized in that: a first set of instructions for issuing a
ConnectedState.Activate command and issuing an
ActiveSetManagement.Open command; a second set of instructions for
determining whether a ConnectedState.ConnectionClosed, an
OverheadMessages.Supervision Failed, a
ControlChannelMAC.SupervisionFailed, an
ActiveSetManagement.AssignmentRejected, or a
ForwardTrafficChannelMAC.SupervisionFailed indication is received;
a third set of instructions for determining whether protocol
receives a Redirect message; and a fourth set of instructions for
issuing an ActiveSetManagement.Close command, performing a clean up
procedure and performing transition to idle state on receiving at
least one of the ConnectedState.ConnectionClosed, the
OverheadMessages.Supervision Failed, the
ControlChannelMAC.SupervisionFailed, the
ActiveSetManagement.AssignmentRejected, or the
ForwardTrafficChannelMAC.SupervisionFailed indication.
5. An apparatus operable in a wireless communication system,
characterized in that: means for issuing a ConnectedState.Activate
command and issuing an ActiveSetManagement.Open command; means for
determining whether a ConnectedState.ConnectionClosed, an
OverheadMessages.Supervision Failed, a
ControlChannelMAC.SupervisionFailed, an
ActiveSetManagement.AssignmentRejected, or a
ForwardTrafficChannelMAC.SupervisionFailed indication is received;
means for determining whether protocol receives a Redirect message;
and means for issuing an ActiveSetManagement.Close command,
performing a clean up procedure and performing transition to idle
state on receiving at least one of the
ConnectedState.ConnectionClosed, the OverheadMessages.Supervision
Failed, the ControlChannelMAC.SupervisionFailed, the
ActiveSetManagement.AssignmentRejected, or the
ForwardTrafficChannelMAC.SupervisionFailed indication.
6. The apparatus as claimed in claim 5, characterized in that means
for issuing an ActiveSetManagement.Deactivate command, issuing an
OverheadMessages.Deactivate command, issuing a
ForwardTrafficChannel.Deactivate command; means for performing a
cleanup procedure and means for transiting to initialization
state.
7. The apparatus as claimed in claim any of preceding claims,
characterized in that means for issuing a
ReverseTrafficChannel.Deactivate command, issuing a
ReverseControlChannelMAC.Deactivate command, issuing an
ActiveSetManagement.Close and issuing a ConnectedState.Deactivate
command.
8. A method of processing on entering a Connected State by an
access network, characterized in that: issuing a
ConnectedState.Activate command and issuing an
ActiveSetManagement.Open command; determining whether protocol
receives a ConnectedState.ConnectionClosed or an
ActiveSetManagement.ConnectionLost indication; determining whether
a Redirect message is sent to an access terminal; and issuing an
ActiveSetManagement.Close command, performing a clean up procedure
and performing transition to idle state on receiving a
ConnectedState.ConnectionClosed, or an
ActiveSetManagement.ConnectionLost indication.
9. The method as claimed in claim 8, characterized in that issuing
an ActiveSetManagement.Deactivate command, performing a cleanup
procedure and performing transition to initialization state on
sending a Redirect message to the access terminal.
10. The method as claimed in claim any of preceding claims,
characterized in that performing the cleanup procedure comprises
issuing a ReverseTrafficChannel.Deactivate command, issuing a
ReverseControlChannel.Deactivate command, issuing an
ActiveSetManagement.Close and issuing a ConnectedState.Deactivate
command.
11. A computer-readable medium including instructions stored
thereon, characterized in that: a first set of instructions for
issuing a ConnectedState.Activate command and issuing an
ActiveSetManagement.Open command; a second set of instructions for
determining whether protocol receives a
ConnectedState.ConnectionClosed or an
ActiveSetManagement.ConnectionLost indication; a third set of
instructions for determining whether a Redirect message is sent to
an access terminal; and a fourth set of instructions for issuing an
ActiveSetManagement.Close command, performing a clean up procedure
and performing transition to idle state on receiving a
ConnectedState.ConnectionClosed, or an
ActiveSetManagement.ConnectionLost indication.
12. An apparatus operable in a wireless communication system,
characterized in that: means for issuing a ConnectedStateActivate
command and issuing an ActiveSetManagement.Open command; means for
determining whether protocol receives a
ConnectedState.ConnectionClosed or an
ActiveSetManagement.ConnectionLost indication; means for
determining whether a Redirect message is sent to an access
terminal; and means for issuing an ActiveSetManagement.Close
command, performing a clean up procedure and performing transition
to idle state on receiving a ConnectedState.ConnectionClosed, or an
ActiveSetManagement.ConnectionLost indication.
13. The apparatus as claimed in claim 12 characterized in that
means for issuing an ActiveSetManagement.Deactivate command, means
for performing a cleanup procedure and means for performing
transition to initialization state.
14. The apparatus as claimed in claim any of preceding claims,
characterized in that means for issuing a
ReverseTrafficChannel.Deactivate command, issuing a
ReverseControlChannel.Deactivate command, issuing an
ActiveSetManagement.Close and issuing a ConnectedState.Deactivate
command.
Description
CLAIM OF PRIORITY UNDER 35 U.S.C.S. 119
[0001] The present application for patent claims priority to
Provisional Application Ser. No. 60/731,126, entitled "METHOD AND
APPARATUS FOR PROVIDING MOBILE BROADBAND WIRELESS LOWER MAC", filed
Oct. 27, 2005, assigned to the assignee hereof, and expressly
incorporated herein by reference.
BACKGROUND
[0002] 1. Field
[0003] The present disclosure relates generally to wireless
communications and more particularly to methods and apparatus for
processing a connected state by an access network or an access
terminal.
[0004] 2. Background
[0005] Wireless communication systems have become a prevalent means
by which a majority of people worldwide have come to communicate.
Wireless communication devices have become smaller and more
powerful in order to meet consumer needs and to improve portability
and convenience. The increase in processing power in mobile devices
such as cellular telephones has lead to an increase in demands on
wireless network transmission systems. Such systems typically are
not as easily updated as the cellular devices that communicate
there over. As mobile device capabilities expand, it can be
difficult to maintain an older wireless network system in a manner
that facilitates fully exploiting new and improved wireless device
capabilities.
[0006] Wireless communication systems generally utilize different
approaches to generate transmission resources in the form of
channels. These systems may be code division multiplexing (CDM)
systems, frequency division multiplexing (FDM) systems, and time
division multiplexing (TDM) systems. One commonly utilized variant
of FDM is orthogonal frequency division multiplexing (OFDM) that
effectively partitions the overall system bandwidth into multiple
orthogonal subcarriers. These subcarriers may also be referred to
as tones, bins, and frequency channels. Each subcarrier can be
modulated with data. With time division based techniques, a each
subcarrier can comprise a portion of sequential time slices or time
slots. Each user may be provided with a one or more time slot and
subcarrier combinations for transmitting and receiving information
in a defined burst period or frame. The hopping schemes may
generally be a symbol rate hopping scheme or a block hopping
scheme.
[0007] Code division based techniques typically transmit data over
a number of frequencies available at any time in a range. In
general, data is digitized and spread over available bandwidth,
wherein multiple users can be overlaid on the channel and
respective users can be assigned a unique sequence code. Users can
transmit in the same wide-band chunk of spectrum, wherein each
user's signal is spread over the entire bandwidth by its respective
unique spreading code. This technique can provide for sharing,
wherein one or more users can concurrently transmit and receive.
Such sharing can be achieved through spread spectrum digital
modulation, wherein a user's stream of bits is encoded and spread
across a very wide channel in a pseudo-random fashion. The receiver
is designed to recognize the associated unique sequence code and
undo the randomization in order to collect the bits for a
particular user in a coherent manner.
[0008] A typical wireless communication network (e.g., employing
frequency, time, and/or code division techniques) includes one or
more base stations that provide a coverage area and one or more
mobile (e.g., wireless) terminals that can transmit and receive
data within the coverage area. A typical base station can
simultaneously transmit multiple data streams for broadcast,
multicast, and/or unicast services, wherein a data stream is a
stream of data that can be of independent reception interest to a
mobile terminal. A mobile terminal within the coverage area of that
base station can be interested in receiving one, more than one or
all the data streams transmitted from the base station. Likewise, a
mobile terminal can transmit data to the base station or another
mobile terminal. In these systems the bandwidth and other system
resources are assigned utilizing a scheduler.
[0009] The signals, signal formats, signal exchanges, methods,
processes, and techniques disclosed herein provide several
advantages over known approaches. These include, for example,
reduced signaling overhead, improved system throughput, increased
signaling flexibility, reduced information processing, reduced
transmission bandwidth, reduced bit processing, increased
robustness, improved efficiency, and reduced transmission power
SUMMARY
[0010] The following presents a simplified summary of one or more
aspects in order to provide a basic understanding of such aspects.
This summary is not an extensive overview of all contemplated
aspects, and is intended to neither identify key or critical
elements of all aspects nor delineate the scope of any or all
aspects. Its sole purpose is to present some concepts of one or
more aspects in a simplified form as a prelude to the more detailed
description that is presented later.
[0011] According to an embodiment, a method is provided for
processing a connected state by an access terminal, the method
comprising issuing a ConnectedState.Activate command and issuing an
ActiveSetManagement.Open command, determining whether a
ConnectedState.ConnectionClosed, an OverheadMessages.Supervision
Failed, a ControlChannelMAC.SupervisionFailed, a
ActiveSetManagement.AssignmentRejected, or a
ForwardTrafficChannelMAC.SupervisionFailed indication is received,
determining whether protocol receives a Redirect message, issuing
an ActiveSetManagement.Close command, performing a clean up
procedure and performing transition to idle state on receiving at
least one of the ConnectedState.ConnectionClosed, the
OverheadMessages.Supervision Failed, the
ControlChannelMAC.SupervisionFailed, the
ActiveSetManagement.AssignmentRejected, or the
ForwardTrafficChannelMAC.SupervisionFailed indication.
[0012] According to another embodiment, a computer-readable medium
is described having a first set of instructions for issuing a
ConnectedState.Activate command and issuing an
ActiveSetManagement.Open command, a second set of instructions for
determining whether a ConnectedState.ConnectionClosed, an
OverheadMessages.Supervision Failed, a
ControlChannelMAC.SupervisionFailed, a
ActiveSetManagement.AssignmentRejected, or a
ForwardTrafficChannelMAC.SupervisionFailed indication is received,
a third set of instructions for determining whether protocol
receives a Redirect message, and a fourth set of instructions for
issuing an ActiveSetManagement.Close command, performing a clean up
procedure and performing transition to idle state on receiving at
least one of the ConnectedState.ConnectionClosed, the
OverheadMessages.Supervision Failed, the
ControlChannelMAC.SupervisionFailed, the
ActiveSetManagement.AssignmentRejected, or the
ForwardTrafficChannelMAC.SupervisionFailed indication.
[0013] According to yet another embodiment, an apparatus operable
in a wireless communication system is described which includes
means for issuing a ConnectedState.Activate command and issuing an
ActiveSetManagement.Open command, means for determining whether a
ConnectedState.ConnectionClosed, an OverheadMessages.Supervision
Failed, a ControlChannelMAC.SupervisionFailed, a
ActiveSetManagement.AssignmentRejected, or a
ForwardTrafficChannelMAC.SupervisionFailed indication is received,
means for determining whether protocol receives a Redirect message,
and means for issuing an ActiveSetManagement.Close command,
performing a clean up procedure and performing transition to idle
state on receiving at least one of the
ConnectedState.ConnectionClosed, the OverheadMessages.Supervision
Failed, the ControlChannelMAC.SupervisionFailed, the
ActiveSetManagement.AssignmentRejected, or the
ForwardTrafficChannelMAC.SupervisionFailed indication.
[0014] According to yet another embodiment, a method is provided
for processing a connected state by an access network, the method
comprising issuing a ConnectedState.Activate command and issuing an
ActiveSetManagement.Open command, determining whether protocol
receives a ConnectedState.ConnectionClosed or an
ActiveSetManagement.ConnectionLost indication, determining whether
a Redirect message is sent to an access terminal, and issuing an
ActiveSetManagement.Close command, performing a clean up procedure
and performing transition to idle state on receiving a
ConnectedState.ConnectionClosed, or an
ActiveSetManagement.ConnectionLost indication.
[0015] According to yet another embodiment, a computer-readable
medium is described having a first set of instructions for issuing
a ConnectedState.Activate command and issuing an
ActiveSetManagement.Open command, a second set of instructions for
determining whether protocol receives a
ConnectedState.ConnectionClosed or an
ActiveSetManagement.ConnectionLost indication, a third set of
instructions for determining whether a Redirect message is sent to
an access terminal, and a fourth set of instructions for issuing an
ActiveSetManagement.Close command, performing a clean up procedure
and performing transition to idle state on receiving a
ConnectedState.ConnectionClosed, or an
ActiveSetManagement.ConnectionLost indication.
[0016] According to yet another embodiment, an apparatus operable
in a wireless communication system is described which includes
means for issuing a ConnectedState.Activate command and issuing an
ActiveSetManagement.Open command, means for determining whether
protocol receives a ConnectedState.ConnectionClosed or an
ActiveSetManagement.ConnectionLost indication, means for
determining whether a Redirect message is sent to an access
terminal, and means for issuing an ActiveSetManagement.Close
command, performing a clean up procedure and performing transition
to idle state on receiving a ConnectedState.ConnectionClosed, or an
ActiveSetManagement.ConnectionLost indication.
[0017] To the accomplishment of the foregoing and related ends, the
one or more aspects comprise the features hereinafter fully
described and particularly pointed out in the claims. The following
description and the annexed drawings set forth in detail certain
illustrative aspects of the one or more aspects. These aspects are
indicative, however, of but a few of the various ways in which the
principles of various aspects may be employed and the described
aspects are intended to include all such aspects and their
equivalents.
BRIEF DESCRIPTION OF THE DRAWINGS
[0018] FIG. 1 illustrates aspects of a multiple access wireless
communication system;
[0019] FIG. 2 illustrates aspects of a transmitter and receiver in
a multiple access wireless communication system;
[0020] FIGS. 3A and 3B illustrate aspects of superframe structures
for a multiple access wireless communication system;
[0021] FIGS. 4A & 4B illustrate aspect of a communication
between an access terminal and an access network;
[0022] FIG. 5A illustrates a flow diagram of a process by an access
terminal;
[0023] FIG. 5B illustrates one or more processors configured for
processing by an access terminal on entering a connected state;
[0024] FIG. 6A illustrates a flow diagram of a process by an access
network; and
[0025] FIG. 6B illustrates one or more processors configured for
processing by an access network on entering a connected state.
DETAILED DESCRIPTION
[0026] Various aspects are now described with reference to the
drawings, wherein like reference numerals are used to refer to like
elements throughout. In the following description, for purposes of
explanation, numerous specific details are set forth in order to
provide a thorough understanding of one or more aspects. It may be
evident, however, that such aspect(s) may be practiced without
these specific details. In other instances, well-known structures
and devices are shown in block diagram form in order to facilitate
describing one or more aspects.
[0027] Referring to FIG. 1, a multiple access wireless
communication system according to one aspect is illustrated. A
multiple access wireless communication system 100 includes multiple
cells, e.g. cells 102, 104, and 106. In the aspect of FIG. 1, each
cell 102, 104, and 106 may include an access point 150 that
includes multiple sectors. The multiple sectors are formed by
groups of antennas each responsible for communication with access
terminals in a portion of the cell. In cell 102, antenna groups
112, 114, and 116 each correspond to a different sector. In cell
104, antenna groups 118, 120, and 122 each correspond to a
different sector. In cell 106, antenna groups 124, 126, and 128
each correspond to a different sector.
[0028] Each cell includes several access terminals which are in
communication with one or more sectors of each access point. For
example, access terminals 130 and 132 are in communication base
142, access terminals 134 and 136 are in communication with access
point 144, and access terminals 138 and 140 are in communication
with access point 146.
[0029] Controller 130 is coupled to each of the cells 102, 104, and
106. Controller 130 may contain one or more connections to multiple
networks, e.g. the Internet, other packet based networks, or
circuit switched voice networks that provide information to, and
from, the access terminals in communication with the cells of the
multiple access wireless communication system 100. The controller
130 includes, or is coupled with, a scheduler that schedules
transmission from and to access terminals. In other aspects, the
scheduler may reside in each individual cell, each sector of a
cell, or a combination thereof.
[0030] As used herein, an access point may be a fixed station used
for communicating with the terminals and may also be referred to
as, and include some or all the functionality of, a base station, a
Node B, or some other terminology. An access terminal may also be
referred to as, and include some or all the functionality of, a
user equipment (UE), a wireless communication device, terminal, a
mobile station or some other terminology.
[0031] It should be noted that while FIG. 1, depicts physical
sectors, i.e. having different antenna groups for different
sectors, other approaches may be utilized. For example, utilizing
multiple fixed "beams" that each cover different areas of the cell
in frequency space may be utilized in lieu of, or in combination
with physical sectors. Such an approach is depicted and disclosed
in co-pending U.S. patent application Ser. No. 11/260,895, entitled
"Adaptive Sectorization in Cellular System."
[0032] Referring to FIG. 2, a block diagram of an aspect of a
transmitter system 210 and a receiver system 250 in a MIMO system
200 is illustrated. At transmitter system 210, traffic data for a
number of data streams is provided from a data source 212 to
transmit (TX) data processor 214. In an aspect, each data stream is
transmitted over a respective transmit antenna. TX data processor
214 formats, codes, and interleaves the traffic data for each data
stream based on a particular coding scheme selected for that data
stream to provide coded data.
[0033] The coded data for each data stream may be multiplexed with
pilot data using OFDM, or other orthogonalization or
non-orthogonalization techniques. The pilot data is typically a
known data pattern that is processed in a known manner and may be
used at the receiver system to estimate the channel response. The
multiplexed pilot and coded data for each data stream is then
modulated (i.e., symbol mapped) based on one or more particular
modulation schemes (e.g., BPSK, QSPK, M-PSK, or M-QAM) selected for
that data stream to provide modulation symbols. The data rate,
coding, and modulation for each data stream may be determined by
instructions performed on provided by processor 230.
[0034] The modulation symbols for all data streams are then
provided to a TX processor 220, which may further process the
modulation symbols (e.g., for OFDM). TX processor 220 then provides
N.sub.T modulation symbol streams to N.sub.T transmitters (TMTR)
222a through 222t. Each transmitter 222 receives and processes a
respective symbol stream to provide one or more analog signals, and
further conditions (e.g., amplifies, filters, and upconverts) the
analog signals to provide a modulated signal suitable for
transmission over the MIMO channel. N.sub.T modulated signals from
transmitters 222a through 222t are then transmitted from N.sub.T
antennas 224a through 224t, respectively.
[0035] At receiver system 250, the transmitted modulated signals
are received by N.sub.R antennas 252a through 252r and the received
signal from each antenna 252 is provided to a respective receiver
(RCVR) 254. Each receiver 254 conditions (e.g., filters, amplifies,
and downconverts) a respective received signal, digitizes the
conditioned signal to provide samples, and further processes the
samples to provide a corresponding "received" symbol stream.
[0036] An RX data processor 260 then receives and processes the
N.sub.R received symbol streams from N.sub.R receivers 254 based on
a particular receiver processing technique to provide N.sub.T
"detected" symbol streams. The processing by RX data processor 260
is described in further detail below. Each detected symbol stream
includes symbols that are estimates of the modulation symbols
transmitted for the corresponding data stream. RX data processor
260 then demodulates, deinterleaves, and decodes each detected
symbol stream to recover the traffic data for the data stream. The
processing by RX data processor 218 is complementary to that
performed by TX processor 220 and TX data processor 214 at
transmitter system 210.
[0037] RX data processor 260 may be limited in the number of
subcarriers that it may simultaneously demodulate, e.g. 512
subcarriers or 5 MHz, and such a receiver should be scheduled on a
single carrier. This limitation may be a function of its FFT range,
e.g. sample rates at which the processor 260 may operate, the
memory available for FFT, or other functions available for
demodulation. Further, the greater the number of subcarriers
utilized, the greater the expense of the access terminal.
[0038] The channel response estimate generated by RX processor 260
may be used to perform space, space/time processing at the
receiver, adjust power levels, change modulation rates or schemes,
or other actions. RX processor 260 may further estimate the
signal-to-noise-and-interference ratios (SNRs) of the detected
symbol streams, and possibly other channel characteristics, and
provides these quantities to a processor 270. RX data processor 260
or processor 270 may further derive an estimate of the "operating"
SNR for the system. Processor 270 then provides channel state
information (CSI), which may comprise various types of information
regarding the communication link and/or the received data stream.
For example, the CSI may comprise only the operating SNR. In other
aspects, the CSI may comprise a channel quality indicator (CQI),
which may be a numerical value indicative of one or more channel
conditions. The CSI is then processed by a TX data processor 278,
modulated by a modulator 280, conditioned by transmitters 254a
through 254r, and transmitted back to transmitter system 210.
[0039] At transmitter system 210, the modulated signals from
receiver system 250 are received by antennas 224, conditioned by
receivers 222, demodulated by a demodulator 240, and processed by a
RX data processor 242 to recover the CSI reported by the receiver
system. The reported CSI is then provided to processor 230 and used
to (1) determine the data rates and coding and modulation schemes
to be used for the data streams and (2) generate various controls
for TX data processor 214 and TX processor 220. Alternatively, the
CSI may be utilized by processor 270 to determine modulation
schemes and/or coding rates for transmission, along with other
information. This may then be provided to the transmitter which
uses this information, which may be quantized, to provide later
transmissions to the receiver.
[0040] Processors 230 and 270 direct the operation at the
transmitter and receiver systems, respectively. Memories 232 and
272 provide storage for program codes and data used by processors
230 and 270, respectively.
[0041] At the receiver, various processing techniques may be used
to process the N.sub.R received signals to detect the N.sub.T
transmitted symbol streams. These receiver processing techniques
may be grouped into two primary categories (i) spatial and
space-time receiver processing techniques (which are also referred
to as equalization techniques); and (ii) "successive
nulling/equalization and interference cancellation" receiver
processing technique (which is also referred to as "successive
interference cancellation" or "successive cancellation" receiver
processing technique).
[0042] While FIG. 2 discusses a MIMO system, the same system may be
applied to a multi-input single-output system where multiple
transmit antennas, e.g. those on a base station, transmit one or
more symbol streams to a single antenna device, e.g. a mobile
station. Also, a single output to single input antenna system may
be utilized in the same manner as described with respect to FIG.
2.
[0043] For a software implementation, the transmission techniques
may be implemented with modules (e.g., procedures, functions, and
so on) that perform the functions described herein. The software
codes may be stored in a memory (e.g., memory 230, 272x or 272y in
FIG. 2) and executed by a processor (e.g., processor 232, 270x or
270y). The memory may be implemented within the processor or
external to the processor.
[0044] It should be noted that the concept of channels herein
refers to information or transmission types that may be transmitted
by the access point or access terminal. It does not require or
utilize fixed or predetermined blocks of subcarriers, time periods,
or other resources dedicated to such transmissions.
[0045] Referring to FIGS. 3A and 3B, aspects of superframe
structures for a multiple access wireless communication system are
illustrated. FIG. 3A illustrates aspects of superframe structures
for a frequency division duplexed (FDD) multiple access wireless
communication system, while FIG. 3B illustrates aspects of
superframe structures for a time division duplexed (TDD) multiple
access wireless communication system. The superframe preamble may
be transmitted separately for each carrier or may span all of the
carriers of the sector.
[0046] In both FIGS. 3A and 3B, the forward link transmission is
divided into units of superframes. A superframe may consist of a
superframe preamble followed by a series of frames. In an FDD
system, the reverse link and the forward link transmission may
occupy different frequency bandwidths so that transmissions on the
links do not, or for the most part do not, overlap on any frequency
subcarriers. In a TDD system, N forward link frames and M reverse
link frames define the number of sequential forward link and
reverse link frames that may be continuously transmitted prior to
allowing transmission of the opposite type of frame. It should be
noted that the number of N and M may be vary within a given
superframe or between superframes.
[0047] In both FDD and TDD systems each superframe may comprise a
superframe preamble. In certain aspects, the superframe preamble
includes a pilot channel that includes pilots that may be used for
channel estimation by access terminals, a broadcast channel that
includes configuration information that the access terminal may
utilize to demodulate the information contained in the forward link
frame. Further acquisition information such as timing and other
information sufficient for an access terminal to communicate on one
of the carriers and basic power control or offset information may
also be included in the superframe preamble. In other cases, only
some of the above and/or other information may be included in this
superframe preamble.
[0048] As shown in FIGS. 3A and 3B, the superframe preamble is
followed by a sequence of frames. Each frame may consist of a same
or a different number of OFDM symbols, which may constitute a
number of subcarriers that may simultaneously utilized for
transmission over some defined period. Further, each frame may
operate according to a symbol rate hopping mode, where one or more
non-contiguous OFDM symbols are assigned to a user on a forward
link or reverse link, or a block hopping mode, where users hop
within a block of OFDM symbols. The actual blocks or OFDM symbols
may or may not hop between frames.
[0049] FIGS. 4A & 4B illustrate communication between an access
terminal (402) and an access network 404 for processing on entering
a connected state. Using a communication link 406 and based upon
predetermined timing, system conditions, or other decision
criteria, the access network 404 exchanges messages 408 & 410
with the access terminal 402 over a communication link 406. The
communication link may be implemented using communication
protocols/standards such as World Interoperability for Microwave
Access (WiMAX), infrared protocols such as Infrared Data
Association (IrDA), short-range wireless protocols/technologies,
Bluetooth.RTM. technology, ZigBee.RTM. protocol, ultra wide band
(UWB) protocol, home radio frequency (HomeRF), shared wireless
access protocol (SWAP), wideband technology such as a wireless
Ethernet compatibility alliance (WECA), wireless fidelity alliance
(Wi-Fi Alliance), 802.11 network technology, public switched
telephone network technology, public heterogeneous communications
network technology such as the Internet, private wireless
communications network, land mobile radio network, code division
multiple access (CDMA), wideband code division multiple access
(WCDMA), universal mobile telecommunications system (UMTS),
advanced mobile phone service (AMPS), time division multiple access
(TDMA), frequency division multiple access (FDMA), orthogonal
frequency division multiple (OFDM), orthogonal frequency division
multiple access (OFDMA), orthogonal frequency division multiple
FLASH (OFDM-FLASH), global system for mobile communications (GSM),
single carrier (1.times.) radio transmission technology (RTT),
evolution data only (EV-DO) technology, general packet radio
service (GPRS), enhanced data GSM environment (EDGE), high speed
downlink data packet access (HSPDA), analog and digital satellite
systems, and any other technologies/protocols that may be used in
at least one of a wireless communications network and a data
communications network.
[0050] Referring to FIG. 4A, according to one embodiment the access
terminal 402 is configured for processing on entering a connected
state. The access terminal receives message 410 which may comprise
a ConnectedState.ConnectionClosed, an OverheadMessages.Supervision
Failed, a ControlChannelMAC.SupervisionFailed, an
ActiveSetManagement.AssignmentRejected, or a
ForwardTrafficChannelMAC.Supervision Failed indication or a
Redirect message 410. The access terminal responds with commands
408 which may comprise a ConnectedState.Activate command and an
ActiveSetManagement.Open command and an ActiveSetManagement.Close
command, or an ActiveSetManagement.Deactivate command, an
OverheadMessages.Deactivate command, a
ForwardTrafficChannel.Deactivate command and a
SharedSignallingMAC.Deactivate command.
[0051] Referring to FIG. 4B, according to another embodiment the
access network 454 is configured for processing on entering a
connected state. The access network receives message 458 which may
comprise a ConnectedState.ConnectionClosed, or an
ActiveSetManagement.ConnectionLost indication. The access network
may respond with commands 460 which may comprise a
ConnectedState.Activate command, ActiveSetManagement.Open command
and an ActiveSetManagement.Close or ActiveSetManagement.Deactivate
and ReverseTrafficChannel.Deactivate command, a
ReverseControlChannel.Deactivate command, an
ActiveSetManagement.Close and a ConnectedState.Deactivate
command.
[0052] The messages 408, 410, 458 and 460 may be incorporated into
one or more data packets 412 which are transmitted on a forward
link 406. In another aspect, the message 410 and 460 may be
transmitted without being incorporated in to a packet. The data
packet comprises header information that indicates whether that
data packet contains the message 410 and 460 or 408 and 458. The
data packet is transmitted on the forward link 406 using one or
more channels. In an aspect, the access network 404 and access
terminal 402 may use a channel of the communication link 406 to
transmit the message 410 and 460 or 408 and 458. The access
terminal 402 and access network 404 is configured to receive data
packets on the communication link 406, one of which may comprise
the message 410 and 460 and 408 and 458 respectively. Various
methods may be used to extract the message 410 & 460 and 408
& 458 from the forward link. For example, once the receiver
(access terminal 402 or access network 404) has extracted the data
packet from one of the channels of the forward link, it may check
the header information of the data packet to determine if the data
packet comprises the message 408 and 458 or 410 and 460. If so,
then the receiver extracts the designated bits and stores the
values in memory 272.
[0053] FIG. 5A illustrates a flow diagram of process 500, according
at an embodiment. At 502, the process commences with the access
terminal issuing a ConnectedState.Activate command and an
ActiveSetManagement. Open command. At 504, the method performs the
steps of determining whether a protocol receives a
ConnectedState.ConnectionClosed, an
OverheadMessages.SupervisionFailed, a
ControlChannelMAC.SupervisionFailed, an
ActiveSetManagement.AssignmentRejected, or a
ForwardTrafficChannelMAC.SupervisionFailed indication. If any of
the indication is received then at 508 the access terminal performs
the step of issuing an ActiveSetManagement.Close command and
performs the clean up procedure at 510 comprising issuing a
ReverseTrafficChannel.Deactivate command, issuing a
ReverseControlChannelMAC.Deactivate command, issuing an
ActiveSetManagement.Close and issuing a ConnectedState.Deactivate
command. At 512, the method comprises performing transition to idle
state. If no indication is received at 504, then at 506 the process
comprises determining whether the protocol receives a Redirect
message. If a Redirect message is received then at 514 the process
comprises steps of issuing an ActiveSetManagement.Deactivate
command, issuing an OverheadMessages.Deactivate command, issuing a
ForwardTrafficChannel.Deactivate command, issuing a
SharedSignallingMAC.Deactivate command. Further at 516 (same as
510), the process comprises the steps of performing a clean up
procedure comprising issuing a ReverseTrafficChannel.Deactivate
command, issuing a ReverseControlChannelMAC.Deactivate command,
issuing an ActiveSetManagement.Close and issuing a
ConnectedState.Deactivate command. Finally at 518 the method
comprises performing transition to initialization state.
[0054] FIG. 5B illustrates a processor 550 for processing of
connected state. The processors referred to may be electronic
devices and may comprise one or more processors configured for
processing connected state according to the embodiment. A processor
552 is configured to issue a ConnectedState.Activate command and an
ActiveSetManagement. Open command. A processor 554 is configured to
determine whether a protocol receives a
ConnectedState.ConnectionClosed, an OverheadMessages.Supervision
Failed, a ControlChannelMAC.SupervisionFailed, an
ActiveSetManagement.AssignmentRejected, or a
ForwardTrafficChannelMAC.SupervisionFailed indication. If any of
the indication is received then a processor 558 is configured to
issue an ActiveSetManagement.Close command and a processor 560 is
configured to perform the clean up procedure comprising steps of
issuing a ReverseTrafficChannel.Deactivate command, issuing a
ReverseControlChannelMAC.Deactivate command, issuing an
ActiveSetManagement.Close and issuing a ConnectedState.Deactivate
command and a processor 562 is configured to perform transition to
idle state. A processor 556 is configured to determine whether the
protocol receives a Redirect message. If a Redirect message is
received then a processor 564 is configured to issue an
ActiveSetManagement.Deactivate command, an
OverheadMessages.Deactivate command, a
ForwardTrafficChannel.Deactivate command, and a
SharedSignallingMAC.Deactivate command. Further a processor 566 is
configured to perform a clean up procedure comprising issuing a
ReverseTrafficChannel.Deactivate command, issuing a
ReverseControlChannelMAC.Deactivate command, issuing an
ActiveSetManagement.Close and issuing a ConnectedState.Deactivate
command. A processor 568 is configured to perform transition to
initialization state. The functionality of the discrete processors
552 to 568 depicted in the figure may be combined into a single
processor 570. A memory 572 is also coupled to the processor
570.
[0055] In an embodiment, an apparatus is described which includes
means for issuing a ConnectedState.Activate command and an
ActiveSetManagement. Open command. A means is provided for
determining whether a protocol receives a
ConnectedState.ConnectionClosed, an OverheadMessages.Supervision
Failed, a ControlChannelMAC.SupervisionFailed, an
ActiveSetManagement.AssignmentRejected, or a
ForwardTrafficChannelMAC.Supervision ailed indication. If any of
the indication is received then a means is provided for issuing an
ActiveSetManagement.Close command and a means is provided for
performing the clean up procedure comprising steps of issuing a
ReverseTrafficChannel.Deactivate command, issuing a
ReverseControlChannelMAC.Deactivate command, issuing an
ActiveSetManagement.Close and issuing a ConnectedState.Deactivate
command and a means is provided for transitioning to idle state. A
means is provided for determining whether the protocol receives a
Redirect message. If a Redirect message is received then a means is
provided for issuing an ActiveSetManagement.Deactivate command, an
OverheadMessages.Deactivate command, a
ForwardTrafficChannel.Deactivate command, and a
SharedSignallingMAC.Deactivate command. Further, a means is
provided for performing a clean up procedure comprising issuing a
ReverseTrafficChannel.Deactivate command, issuing a
ReverseControlChannelMAC.Deactivate command, issuing an
ActiveSetManagement.Close and issuing a ConnectedState.Deactivate
command. A means is further provided for transitioning to
initialization state. The means described herein may comprise one
or more processors.
[0056] FIG. 6A illustrates a flow diagram of process 600, according
to another embodiment. At 602, the process commences with the
access network issuing a ConnectedState.Activate command and an
ActiveSetManagement.Open command. At 604, the method performs the
steps of determining whether a protocol receives a
ConnectedState.ConnectionClosed, or an
ActiveSetManagement.ConnectionLost indication. If any of the
indication is received then at 608 the access terminal performs the
step of issuing an ActiveSetManagement.Close command and performs a
cleanup procedure at 610 comprising issuing a
ReverseTrafficChannel.Deactivate command, issuing a
ReverseControlChannel.Deactivate command, issuing an
ActiveSetManagement.Close and issuing a ConnectedState.Deactivate
command and at 612 the method comprises performing transition to
idle state. If no indication is received at 604, then at 606 the
process comprises determining whether a Redirect message is sent to
an access terminal. If a Redirect message is sent then at 614 the
process comprises steps of issuing an
ActiveSetManagement.Deactivate command. Further at 616 (same as
610), the process comprises the steps of performing a cleanup
procedure comprising issuing a ReverseTrafficChannel.Deactivate
command, issuing a ReverseControlChannel.Deactivate command,
issuing an ActiveSetManagement.Close and issuing a
ConnectedState.Deactivate command. Finally at 618 the method
comprises performing transition to initialization state.
[0057] FIG. 6B illustrates a processor 650 for processing by an
access network on entering a connected state The processors
referred to may be electronic devices and may comprise one or more
processors configured for processing by an access network on
entering a connected state according to the embodiment. A processor
652 is configured to issue a ConnectedState.Activate command and an
ActiveSetManagement.Open command. A processor 654 is configured to
determine whether a protocol receives a
ConnectedState.ConnectionClosed or an
ActiveSetManagement.ConnectionLost indication. If any of the
indication is received then a processor 658 is configured to issue
an ActiveSetManagement.Close command and a processor 660 is
configured to perform a cleanup procedure comprising steps of
issuing a ReverseTrafficChannel.Deactivate command, issuing a
ReverseControlChannel.Deactivate command, issuing an
ActiveSetManagement.Close and issuing a ConnectedState.Deactivate
command and a processor 662 is configured to perform transition to
idle state. A processor 656 is configured to determine whether the
access network has sent a Redirect message to an access terminal.
If a Redirect message is sent then a processor 664 is configured to
issue an ActiveSetManagement.Deactivate command. Further a
processor 666 is configured to perform the cleanup procedure
comprising issuing a ReverseTrafficChannel.Deactivate command,
issuing a ReverseControlChannel.Deactivate command, issuing an
ActiveSetManagement.Close and issuing a ConnectedState.Deactivate
command. A processor 668 is configured to perform transition to
initialization state. The functionality of the discrete processors
652 to 668 depicted in the figure may be combined into a single
processor 670. A memory 672 is also coupled to the processor
670.
[0058] In an embodiment, an apparatus is described which includes
means for issuing a ConnectedState.Activate command and an
ActiveSetManagement.Open command. A means is provided for
determining whether a protocol receives a
ConnectedState.ConnectionClosed or an
ActiveSetManagement.ConnectionLost indication. If any of the
indication is received then a means is provided for issuing an
ActiveSetManagement.Close command and a means is provided for
performing a cleanup procedure comprising steps of issuing a
ReverseTrafficChannel.Deactivate command, issuing a
ReverseControlChannel.Deactivate command, issuing an
ActiveSetManagement.Close and issuing a ConnectedState.Deactivate
command and a means is provided for performing transition to idle
state. A means is provided for determining whether the access
network has sent a Redirect message to an access terminal. If a
Redirect message is sent then a means is provided for issuing an
ActiveSetManagement.Deactivate command. Further, a means is
provided for performing the cleanup procedure comprising issuing a
ReverseTrafficChannel.Deactivate command, issuing a
ReverseControlChannel.Deactivate command, issuing an
ActiveSetManagement.Close and issuing a ConnectedState.Deactivate
command. A means is provided for performing transition to
initialization state. The means described herein may comprise one
or more processors.
[0059] Furthermore, embodiments may be implemented by hardware,
software, firmware, middleware, microcode, or any combination
thereof. When implemented in software, firmware, middleware or
microcode, the program code or code segments to perform the
necessary tasks may be stored in a machine readable medium such as
a separate storage(s) not shown. A processor may perform the
necessary tasks. A code segment may represent a procedure, a
function, a subprogram, a program, a routine, a subroutine, a
module, a software package, a class, or any combination of
instructions, data structures, or program statements. A code
segment may be coupled to another code segment or a hardware
circuit by passing and/or receiving information, data, arguments,
parameters, or memory contents. Information, arguments, parameters,
data, etc. may be passed, forwarded, or transmitted via any
suitable means including memory sharing, message passing, token
passing, network transmission, etc.
[0060] Various modifications to these aspects will be readily
apparent to those skilled in the art, and the generic principles
defined herein may be applied to other aspects. Thus, the
description is not intended to be limited to the aspects shown
herein but is to be accorded the widest scope consistent with the
principles and novel features disclosed herein.
* * * * *