WO2002039609A1 - Method and apparatus for controlling signal power level in a communication system - Google Patents
Method and apparatus for controlling signal power level in a communication system Download PDFInfo
- Publication number
- WO2002039609A1 WO2002039609A1 PCT/US2001/045564 US0145564W WO0239609A1 WO 2002039609 A1 WO2002039609 A1 WO 2002039609A1 US 0145564 W US0145564 W US 0145564W WO 0239609 A1 WO0239609 A1 WO 0239609A1
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- WIPO (PCT)
- Prior art keywords
- signal
- interference
- data
- determining
- received signal
- Prior art date
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Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/18—TPC being performed according to specific parameters
- H04W52/20—TPC being performed according to specific parameters using error rate
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/18—TPC being performed according to specific parameters
- H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/06—TPC algorithms
- H04W52/12—Outer and inner loops
Definitions
- the disclosed embodiments relates to the field of communications.
- the disclosed embodiments relate to control of signal power
- CDMA Code division multiple access
- a number of users in the same geographical area may
- a receiver receiving signals from
- the users with common carrier frequency decodes each signal according to the
- one of the basic principles for operating a CDMA system is based on a method
- a signal to interference threshold for controlling a power level of a
- FIG. 1 illustrates a general block diagram of a communication system
- FIG. 2 illustrates a general block diagram of a transmitter
- FIG. 3 illustrates a block diagram of a Walsh coverin /spreading
- Fig. 4 illustrates a block diagram of a receiver
- FIG. 5 illustrates a block diagram of an exemplary turbo encoder
- FIG. 6 illustrates a block diagram of a conventional turbo decoder
- FIG. 7 illustrates an operational flow diagram for interference
- FIG. 8 illustrates a flow diagram of an exemplary closed loop power
- FIG. 9 illustrates a flow chart for determining a new set point to be used
- FIG. 1 illustrates a general block diagram of a communication system 100
- Such standards include the TIA/EIA-95
- communication system 100 includes a base station (BS) 101
- BS 101 may include a number of components, such as a
- BS 101 may also be in communication with other base stations (not limited to,
- BS 101 communicates with each mobile station (MS) via
- the forward link is maintained by a forward link signal 106
- Each of MSs 102-104 receiving signal may be summed to form signal 106.
- Each of MSs 102-104 receiving signal may be summed to form signal 106.
- Each receiving MSs 102-104 may
- Each MSs 102-104 communicates with BS 101 via a
- reverse link signal such as reverse link signals 107-109 for respectively MSs
- BS 101 may also transmit a predefined series of data bits on a pilot
- Each MS may transmit a pilot channel
- the pilot channel transmitted from the MS may be used for
- each mobile stations 102-104 and BS 101 are included in each mobile stations 102-104 and BS 101.
- FIG. 2 illustrates a general block diagram of a transmitter 200 for use in
- Transmitter 200 may be used in a CDMA system operating according to the IS-
- Channel data bits are input to a channel encoder 201 to produce
- channel encoder 201 may perform the following functions in channel encoder 201 .
- blocks of data are produced for every block of data at the input of encoder 201.
- Encoder 201 passes the channel encoded
- Block interleaver 202 symbols to a block interleaver 202 for an interleaving function.
- interleaver 202 rearranges the position of the data symbols in each block of data
- the interleaved data symbols are input to a long code scrambling /modulator
- a long code mask is assigned to each user.
- Other functions such as
- multiplexer 204 de-multiplexes the output of the long code
- quad-phase data symbol 212 for Walsh covering and BPSK or QPSK PN
- covering /spreading block 205 modulates and spreads the input data symbols
- FIG. 3 illustrates a block diagram of Walsh covering/ spreading block
- Block 205 may also be used by the mobile stations for
- Block 205 may include more or less
- a Walsh code normally is assigned to
- the Walsh cover operation for a channel is shown in a Walsh cover
- the Walsh cover operation in block 310 includes multiplying the
- the forward link signal may be a combined signal of several signals
- I signals 306 and 341 are summed in summing block
- the next operation in block 205 includes complex multiplier operation
- Signals 345 and 346 are complex
- multiplier 370 allows spreading signals 345 and 346 to produce I and Q signals
- Base band filters 373 and 374 may be used to filter I and Q signals
- multipliers 375 and 376 are used. The resulting signals are combined in a
- FIG. 4 illustrates a block diagram of a receiver 400 used for processing
- Receiver 400 demodulates the received signal to extract the
- Receive (Rx) samples are stored in
- Receive samples are generated by a radio frequency/intermediate
- RF/IF frequency frequency
- RF/IF system 490 may be any conventional RF/IF receiver.
- the samples are supplied to a
- demux 402 The output of demux 402 is supplied to a searcher
- a control unit 410 is coupled thereto.
- combiner 412 couples a decoder 414 to finger elements 408.
- control unit 410 is a microprocessor controlled by software
- unit 410 configures finger elements 408 to perform demodulation of the
- Decoder 414 decodes the data, and outputs the decoded data.
- searcher 406 uses non-coherent demodulation
- finger elements 408 is performed via coherent demodulation of other channels
- the searcher is used in finger elements 408 for demodulation of other channels.
- the searcher is used in finger elements 408 for demodulation of other channels.
- the results of the demodulation may be combined in combiner 412 before decoding the data on each channel.
- Receiver 400 may be used in BS 101 and mobile
- BS 101 may employ several of receiver 400 to decode the
- FIG. 5 illustrates a block diagram of an exemplary turbo encoder 500 that
- channel encoder 201 may be used in channel encoder 201 for turbo encoding the channel data bits.
- Turbo encoder 500 includes a first and second encoder blocks 501 and 502, and
- Encoder 501 produces data symbols Yi after encoding
- operation may include encoding according to a convolutional code transfer
- Such a function may be defined by a transfer function
- Encoding block 502 outputs
- Data symbols Xi input interleaver 503 for an interleaving
- interleaver 503 may be according to any of the known interleaver operations.
- Data symbols Zi consist of data symbols Xi re-arranged in an order according to an interleaving mapping function.
- Encoder 502 encodes data symbols Zi and
- Encoding functions used in encoders 501 and 502 may be the same or
- block 520 receives data symbols Xi at input 510, data symbols Yi produced by
- encoder 501 at an input 511, and data symbols Wi produced by encoder 502 at
- Puncturing block 520 according to a puncturing pattern selects
- block interleaver 202 passes on to block interleaver 202 for a data block interleaving operation.
- the transmitted data symbols consist mainly of data symbols Xi, Yi and
- Transmission of data symbols Xi, Yi and Wi may include signal
- Such a transmitter is well known by one of ordinary skill in the
- Decoder 414 in receiver 400 receives the noisy version of data
- FIG. 6 illustrates a block diagram of a conventional turbo decoder 600 for
- Decoder 600 may be used in decoder block 414 of receiver 400. Data symbols
- Xi, Yi and Wi pass through a data symbol selector block 620 which operates to
- Data symbols Zi and Wi pass to a decoder block 602 at an
- Decoder 601 decodes data symbols Xi and Yi according to a coding
- Decoder 601 produces estimates of data
- Decoder 602 decodes data symbols Zi and Wi
- Decoder 602 uses the estimates of data symbols Zi at input 632 with the
- interleaver 530 in turbo encoder 500, and to produce estimates of data symbols
- FIG. 7 illustrates an operational flow diagram 700 for interference
- the received samples after being read from RAM 404, are
- the correlation process may collectively be
- the correlation process may be repeated for each
- each received signal may be unique because each signal may require a
- Each signal may include a traffic
- pilot channel carried by each signal may be different.
- process may include channel estimation which includes estimating the channel
- the channel estimation informations are then used for correlating with the
- Each traffic channel is then decoded.
- Decoder 414 may perform the decoding step. If the transmitted channel is not
- decoding step 414 is performed
- decoding step 414 is performed according to the utilized turbo code.
- decoder 600 may be used in decoder 414. Each signal is, therefore, decoded to
- the CRC check is a temporary decision part of the interference
- the decoded channel is a
- transmit the traffic channel is employed in the re-spreading process.
- the process of re-encoding and re-spreading may involve
- each channel is determined based on the associated pilot channel fading
- Such re-encoding and re-spreading may be performed by a
- the original samples may be read at step 704 from memory.
- encoded and re-spread samples are multiplied by the channel estimation parameters produced as a result of decoding an associated pilot channel before
- RAM 404 may store the resulting samples until the process is
- decoding step 707 The results of decoding step 707 at this point have less error
- the process may be repeated by checking the CRC of
- the turbo decoding process may
- estimates of Xi determined at one step may include an iterative process. Also, estimates of Xi determined at one step may
- step 702 may be used at decoding step 707 to improve the decoding process at step 707. For example, the estimates of data symbols Xi associated with the
- step 707 For example, data symbols Xi associated with the first channel
- the process of re-encoding and re-spreading may involve re-estimating
- parameters include fading parameters associated with a pilot channel.
- the re-estimated channel is then used to reconstruct the
- the process of decoding at a later stage may be
- the samples used for each cancellation process may have to
- the signals received by BS 101 may be input to receiver 400.
- Antenna Antenna
- RF/IF system 490 receive the signals from the mobile stations to produce the samples of the received signals.
- the received samples may be
- Receiver 400 may incorporate a number of searchers 406, a
- decoders 414 for simultaneously performing the correlation steps of 701 and
- turbo encoding process at the transmitter decoding steps 702 and 707
- decoder 414 may be according to the operation of turbo decoder
- RF/IF system 490 RF/IF system 490
- the received samples may be stored in RAM 404.
- Searcher 406 in combination
- finger element 408 determines a first channel estimate based on a first set
- the first set of pilot signal samples are included in the first set of pilot signal samples.
- Finger element 408, combiner 412, and decoder 414 correlate
- Controller 410 in connection with other
- RAM 404 re-encodes and re-spreads the decoded received
- modifying step may include multiplying the re-encoded and re-spread samples
- Controller 410 performs interference cancellation on the
- samples may be stored in RAM 404.
- the new set of received samples as a result
- the cancelled components from the samples are based on the modified re-
- samples represent accurate samples in terms of amplitude and phase for the
- searcher 406 in combination with finger element 408
- the second set of pilot samples are included in the new set of
- Determining the second channel estimate may be necessary
- decoder 414 in combination correlate and decode the new received samples in
- Controller 410 re-encodes and re-spreads the new decoded received
- the modifying process may include multiplying the new re-encoded
- Controller 410 performs
- the newly generated set of received samples as a
- modified re-encoded and re-spread samples may be
- the decoding process may be in accordance with a turbo decoding
- the controller 410 may determine whether a cyclic
- redundancy check based on a result of the decoding process passes a
- the cancellation process may be conditioned on
- the decoding result may not be suitable for re-encoding and re-
- a result of decoding at one iteration may be used in assisting the decoding process at a subsequent
- searcher 406 Each time a correlation process is performed, searcher 406 and finger
- element 408 may start anew for determining non-coherent demodulation of a
- finger element 408, or searcher 406 and finger element 408 in combination may
- interference level of each signal may be reduced each time some samples are
- the S/I may be
- the ratio Eb/I may be synonymous with the ratio S/I.
- the ratio S/I may be synonymous with the ratio S/I.
- Eb/I is a measure of signal energy over interference per unit of a data symbol
- S/I and Eb/I may be interchangeable in some respects.
- the MS In order for an MS to receive communication services from a BS, the MS
- the first state may be the initial
- the access state for registering with the BS to set up a communication link.
- next state may be the idle state in which the MS has completed the initial
- the MS may
- the MS may be in a connected state. In the
- the MS is either receiving data or waiting to receive data.
- the system controls the signal level transmitted
- each MS or the communication data rate, or both.
- each MS or the communication data rate, or both.
- the output power level of the MSs is controlled by two
- control is based on the need of each MS to maintain an adequate
- the MS may make the independent measurement
- FIG. 8 illustrates a flow diagram 800 of an exemplary closed loop power
- power control method 800 begins once an MS in communication system 100
- the MS sets an initial reverse channel power level.
- the initial power level setting on the reverse link is then adjusted during the communication link via
- the closed loop power control 800 controls the closed loop power level control 800.
- loop power control 800 provides correction to the open loop power control.
- the closed loop power control 800 operates in conjunction
- BS 101 at step 801 measures the signal to interference
- measured S/I is compared with a set point S/I at step 802.
- Eb/I which is a ratio of bit energy over interference
- the set point may be in the same form.
- the set point is selected
- the set point may be initially based on open loop power
- the set point it indicates that the mobile station is transmitting on the reverse
- the mobile station As a result of increasing the power level, the mobile station
- the inner loop power control keeps the reverse link
- the target S/I is based on the set point selected for the mobile
- the power up or power down may be performed several times during
- one time frame may be divided into 16
- Each power control group consists of several data
- the power up or power down command may be transmitted 16 times
- control loop 800 continues to measure S/I of the reverse link signal during the
- next power control group at step 801.
- the process is repeated at steps 802-804.
- a single set point or target may not be satisfactory for all conditions.
- the set point used at step 802 may also change depending on a
- a new S/I set point may be calculated at step 806.
- the new set point may be
- the set point may be raised to a higher level.
- the mobile station consequently increases its reverse link
- the set point may be lowered to a lower
- the mobile station By lowering the set point to a lower level, the mobile station
- control may command once every frame, and the closed loop power control
- control group may be, respectively, 20 and 1.25 mSec long, in accordance with
- the system may also employ a forward link power control scheme to
- the MS communicates to the BS periodically about the
- the power level of the forward link signal is adjusted based on the
- a reverse link erasure bit may be used to
- the channel power gain may be continuously adjusted while monitoring the
- the forward link may be transmitted to the forward link
- forward link power control is generally for controlling interference in a
- the data rate may be lowered while keeping the power level constant
- the data rate may also be lowered to overcome the effect of the interference.
- the MS adjusts the output power level by
- MS sets the output power of the enhanced access channel header, the enhanced
- the output power level of the reverse pilot channel is the output power level of the reverse pilot channel.
- the reverse pilot channel is set by the open and closed loop power controls.
- the MS maintains a power level ratio between the code channel power level
- the ratio may be defined by the data
- a table provides the values for the
- the ratio generally increases for higher data rates.
- a ratio equal to one may also be possible.
- the power is provided at a ratio equal to one, the power
- level of the pilot channel as set by the power control loop 800 may be equal to
- the data rate and the traffic channel power level may be adjusted.
- power level may be selected based on a relative power of the reverse link pilot.
- a BS may be providing communication links to a large
- one MS in a forward link For example, one MS in a forward link
- connected state may be receiving data at a low data rate, and another MS
- the BS may be receiving a high data rate.
- the BS may be receiving a
- independent measurement may decide and request a desired data rate from the
- the desired forward link data rate is communicated to
- the BS attempts to provide a DRC (DRC) channel.
- DRC data rate control
- MS may autonomously select a reverse link data rate from a number of possible
- the selected data rate may be any one of the reverse link data rates.
- the selected data rate may be any one of the reverse link data rates.
- the selected data rate may be any one of the reverse link data rates.
- the selected data rate may be any one of the reverse link data rates.
- Each MS may also communicated to the BS via a reverse rate indicator channel.
- Each MS may also communicated to the BS via a reverse rate indicator channel.
- Each MS may also communicated to the BS via a reverse rate indicator channel.
- a grade of service may limit
- the forward and reverse links may have similar data rate activities in the case of voice
- the forward and reverse links data rates may be limited to
- CDMA multiple access
- the senor may be retrieving a large data file from a database. In such a case, the
- the data rate on the forward link may reach 2.5
- the data rate on the forward link may be based on a
- the MS data rate request made by the MS.
- the reverse link the reverse link
- data rate is lower, and may range from 4.8 to 153.6 Kbps.
- closed loop power control 800 the operation of closed loop power control 800
- step 806 involves determining a new set point at step 806. Determining the new set
- determining a frame error rate as illustrated in FIGs. 4 and 7 may involve
- each reverse link signal is determined based on the decoding results at step 707.
- the frame error rate for each reverse link channel may be used at step 806 of
- FIG. 8 to determine a new set point for each corresponding reverse link closed
- FIG. 9 illustrates a flow chart 900 for determining a new set point in
- step 901 includes determining if any interference cancellation has taken
- FIG. 7 involves no interference cancellation such as shown at
- step 705 a new set point is determined based on the frame error rate. If the
- the set point is increased at step 902, for example
- the set point is decreased at step 902, for example by a predetermined amount
- FIG. 7 involves interference cancellation like those shown at
- step 705 a new set point is determined based on the frame error rate and S/I of
- receiver 400 may be performed by an exemplary embodiment of receiver 400 shown in FIG.
- the decoding operation may be used to determine the S/I of the received signal before and after the interference cancellation process at step 705.
- the decoding operation may be
- decoder 414 After decoding step 702 is performed by decoder
- decoder 414 signals sample RAM 404 in connection with control
- searcher 406 finger element 408, and possibly combiner
- interference cancellation performed at step 705 may have changed the signal
- step 905 the difference (delta value) S/I of the signal before and after
- the new set point may be calculated by
- the new set point is provided at step 802 of FIG. 8 to be used for
- the S/I based on the interference cancellation process improves, in at least one
Abstract
Description
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Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2002220091A AU2002220091A1 (en) | 2000-11-09 | 2001-11-07 | Method and apparatus for controlling signal power level in communication system |
BR0115214-9A BR0115214A (en) | 2000-11-09 | 2001-11-07 | Method and equipment for controlling the signal strength level in a communication system. |
JP2002541814A JP2004514318A (en) | 2000-11-09 | 2001-11-07 | Method and apparatus for controlling signal power level in a communication system |
EP01993985A EP1336256A1 (en) | 2000-11-09 | 2001-11-07 | Method and apparatus for controlling signal power level in a communication system |
KR10-2003-7006274A KR20040011429A (en) | 2000-11-09 | 2001-11-07 | Method and apparatus for controlling signal power level in a communication system |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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US09/711,110 US6609008B1 (en) | 2000-11-09 | 2000-11-09 | Method and apparatus for controlling signal power level in a communication system |
US09/711,110 | 2000-11-09 |
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WO2002039609A1 true WO2002039609A1 (en) | 2002-05-16 |
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PCT/US2001/045564 WO2002039609A1 (en) | 2000-11-09 | 2001-11-07 | Method and apparatus for controlling signal power level in a communication system |
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US (1) | US6609008B1 (en) |
EP (1) | EP1336256A1 (en) |
JP (1) | JP2004514318A (en) |
KR (1) | KR20040011429A (en) |
CN (1) | CN1473400A (en) |
AU (1) | AU2002220091A1 (en) |
BR (1) | BR0115214A (en) |
TW (1) | TW584996B (en) |
WO (1) | WO2002039609A1 (en) |
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Also Published As
Publication number | Publication date |
---|---|
TW584996B (en) | 2004-04-21 |
KR20040011429A (en) | 2004-02-05 |
EP1336256A1 (en) | 2003-08-20 |
US6609008B1 (en) | 2003-08-19 |
BR0115214A (en) | 2005-02-01 |
CN1473400A (en) | 2004-02-04 |
AU2002220091A1 (en) | 2002-05-21 |
JP2004514318A (en) | 2004-05-13 |
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