US20020067701A1 - Advanced access channel methods and systems - Google Patents
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- US20020067701A1 US20020067701A1 US09/983,425 US98342501A US2002067701A1 US 20020067701 A1 US20020067701 A1 US 20020067701A1 US 98342501 A US98342501 A US 98342501A US 2002067701 A1 US2002067701 A1 US 2002067701A1
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Definitions
- the invention relates to CDMA systems, and in particular to channels, methods and systems for performing access in such systems.
- 1xEV-DV is a wireless technology related to 3GPP2 (3rd generation partnership project 2) wireless standardization process. 1xEV-DV technology has been designed to offer wireless operators a cost-effective migration path to provide integrated voice and data speeds up to 5.2 Mbps on a single 1.25 MHz code division multiple access (CDMA) carrier. 1XEV-DV enables real time voice, data and multimedia services on existing cdma2000 networks allowing end users to browse the Internet from a personal computer or access email while “on the go”. 1xEV-DV is a global open standards proposal intended as an orderly migration path beyond IS-2000 1 ⁇ in order to allow wireless network operators to provide their customers with integrated real-time voice and data at a higher data rate.
- 3GPP2 3rd generation partnership project 2
- 1xEV-DV technology has been designed to offer wireless operators a cost-effective migration path to provide integrated voice and data speeds up to 5.2 Mbps on a single 1.25 MHz code division multiple access (CDMA) carrier.
- CDMA code division multiple access
- a reverse link access channel and a forward link control channel are used to exchange signaling information between a Wireless terminal and a Base Station (BS).
- An effective access channel for accessing the forward traffic channel is required.
- IS-2000 introduces an enhanced access channel which can operate in three possible modes: basic access mode, power controlled access mode, and reservation access mode.
- basic access mode When operating in the basic access mode, the access channel is not power controlled.
- power control starts only after a power control (PC) bit assignment message from the base station or after a common control channel assignment message from the base station and this does not occur until after a significant delay,
- PC power control
- Various embodiments of the invention provide an advanced access channel through which wireless terminals can access an access network.
- Other embodiments provide a method of performing power control using a shared power control channel.
- the shared power control channel is also used in conjunction with the advanced access channel to provide an acknowledgement mechanism.
- the invention provides a method of providing forward shared power control.
- the method involves transmitting a shared power control channel in which is allocated one power control bit per power control period for each of a plurality of users with the bit being a three state bit, the three states being a zero state, a one state, and a no energy state, each of the three states indicating one of an increase, decrease, or no change to transmit power.
- the method further involves periodically allocating at least one power control bit for each of the plurality of users which indicates a relative gain adjustment, the relative gain adjustment instructing a change in a gain adjustment applied to at least one channel of the user compared to a gain adjustment applied to at least one other channel of the user.
- each of the at least one power control bit which indicates a relative gain adjustment is a three state bit, the three states being a zero state, a one state, and a no energy state, each of the three states indicating one of increase in the gain adjustment applied to the one channel over the gain adjustment applied to the at least one other channel, a decrease in a gain adjustment applied to the one channel over the gain adjustment applied to the at least one other channel, or no change to the relative gain to be applied to the one channel over the at least one other channel.
- the power control bits are transmitted using a unique long code mask.
- the shared power control channel comprises a plurality of time multiplexed subchannels, with one subchannel being used to transmit power control bits to a given user.
- the invention provides a transmitter adapted to perform power control.
- the transmitter has a signal strength measurement circuit adapted to measure a signal strength indication for a respective signal received from each of a plurality of wireless terminals.
- the transmitter also has power control circuitry adapted to decide based on the signal strength indication whether to instruct each of the wireless terminals to increase its transmit power, decrease its transmit power, or not to change its transmit power and to transmit a shared power control channel in which is allocated one power control bit per power control period for each of a plurality of wireless terminals with the bit being a three state bit, the three states being a zero state, a one state, and a no energy state, each of the three states indicating one of an increase, decrease, or no change to transmit power.
- the transmitter is further adapted to transmit relative gain adjustments on the shared power control channel.
- the invention provides a wireless terminal having receive circuitry adapted to extract power control bits from a shared power control channel, the power control bits having three possible states, the three states being a zero state, a one state, and a no energy state, and depending upon the a state of a given extracted power control bit to make one of three power control decisions, the three decisions being to increase, decrease, or make no change to a transmit power.
- the wireless terminal is adapted to maintain a first and second threshold, wherein a received value of an extracted power control bit below the first threshold is interpreted as a first of the three decisions, a received value of an extracted power control bit between the first threshold and the second threshold is interpreted as a second of the three decisions, and a received value of an extracted power control bit greater than the second threshold is interpreted as the third of the three decisions.
- the wireless terminal is further adapted to make dynamic adjustments to the first threshold and the second threshold as a function of a signal to noise ratio estimated by the wireless terminal.
- the wireless terminal is further adapted to interpret a subset of the extracted power control bits as adjustments to a relative amount by which the transmit power is increased and/or decreased for one transmit channel compared to another transmit channel upon receipt of an appropriate power control bit.
- the invention provides a system adapted to facilitate an access probe from a wireless terminal in which power control commands are transmitted to the wireless terminal during a preamble portion of the access probe.
- power control commands sent during the preamble portion of the access probe are treated as an implicit acknowledgement by the wireless terminal.
- power control commands are transmitted to the wireless terminal after a request portion of the access probe, both to power control the wireless terminal, and to indicate acceptance of requested parameters in the request portion of the access probe.
- Another broad aspect of the invention provides a method of accessing a wireless access network.
- the method involves a first wireless terminal sending an access probe which comprises an initial preamble, a request message and a data content.
- a predetermined long code mask is allocated for the use of transmitting access probes by a plurality of wireless terminals including said first wireless terminal, the predetermined long code mask having a time-dependent field which can take on one of a plurality M of values, thereby allowing up to M independent overlapping access probes each starting at a different time offset, thereby defining M access sub-channels.
- the method further involves the first wireless terminal selecting an access sub-channel for use in transmitting the access probe as a function of a time at which a user initiated the access probe.
- the method preferably further involves the first wireless terminal looking for power control information from a base station in respect of the access subchannel while transmitting the preamble, and treating such power control information when detected as an implicit acknowledgement of the preamble.
- the request message and the data message are not sent until the power control information is detected.
- the method further involves a component of the access network broadcasting information comprising one or more of: an slot duration indicating a size of the time offset between access subchannels; a number M of offsets available corresponding to a number of access subchannels; and a maximum total access probe duration.
- a component of the access network broadcasting information comprising one or more of: an slot duration indicating a size of the time offset between access subchannels; a number M of offsets available corresponding to a number of access subchannels; and a maximum total access probe duration.
- the method further involves a component of the access network monitoring for a preamble portion of access probes on the access subchannels, and when a preamble portion is detected on a given access subchannel, transmitting power control commands on a power control subchannel associated with the given access subchannel.
- Another broad aspect of the invention provides a method of performing an access attempt.
- the method involves a wireless terminal acquiring time synchronization with the base station.
- the wireless terminal selects an advanced access subchannel from one of a plurality of time dependent advanced access subchannels based on when the access attempt was initiated.
- the wireless terminal transmits an access preamble using the selected advanced access subchannel and at the same time monitors the energy of the shared power control subchannel associated with the selected advanced access subchannel. If sufficient energy is detected in the shared power control subchannel associated with the selected advanced access subchannel, the wireless terminal transmits a request message followed by a user data packet, and during this transmission, the wireless terminal continues to monitor the energy of the shared power control subchannel associated with the selected advanced access subchannel.
- the wireless terminal controls a transmit power as a function of power control commands received on the shared power control subchannel associated with the selected advanced access subchannel.
- the wireless terminal begins to transmit power control commands to the base station on a pilot channel transmitted by the wireless terminal to control the power of the shared power control subchannel on the forward link, for example as per power control bits transmitted in 1xRTT to power control the forward traffic channel.
- the wireless terminal prior to transmitting the preamble, the wireless terminal monitors an energy of a shared power control subchannel associated with the selected advanced access subchannel, and if there is energy measured in the shared power control subchannel, the wireless terminal determines that this channel is being used by an another wireless terminal, and waits a random back off time before transmitting the preamble on another advanced access subchannel.
- Another broad aspect of the invention provides an access network component adapted to acknowledge an access attempt received on an access sub-channel by immediately starting to transmit power control commands on a power control subchannel in one-to-one correspondence with the access sub-channel.
- the access network component is further adapted to receive request parameters as part of the access attempt, and to acknowledge/grant the request parameters by continuing to send power control commands on the power control subchannel, and to deny the request parameters by ceasing to send any energy on the power control subchannel.
- Another broad aspect of the invention provides a wireless terminal adapted to access an access network by sending an access probe which comprises an initial preamble, a request message and a data content.
- the wireless terminal is adapted to use a predetermined long code mask allocated for the use of transmitting access probes, the predetermined long code mask having a time-dependent field which can take on one of a plurality M of values, thereby allowing up to M independent overlapping access probes each starting at a different time offset, thereby defining M access subchannels.
- FIG. 1 is a schematic showing an access channel set by which advanced access is achieved in accordance with an embodiment of the invention
- FIG. 2 is an example of a long code mask applied to access channel probes
- FIG. 3 is an example of the time offset of different advanced access subchannels, and also shows associated power control subchannels
- FIG. 4 is a table showing an example advanced access channel modulation parameters
- FIG. 5 is an example of a long code mask applied to a shared power control channel
- FIG. 6 is a flowchart of a method by which a wireless terminal transmits an advanced access probe
- FIG. 7 is a timing diagram showing an example of two access attempts
- FIG. 8 is a schematic diagram of a detailed example implementation of the advanced access channel structure implemented by a wireless terminal
- FIG. 9 is a schematic diagram of a detailed example implementation of the SHPCCH channel structure by a basestation
- FIG. 10 illustrates gain determination at a base station, and power control bit interpretation at a wireless terminal
- FIG. 11 illustrates a relative gain adjustment power control bit.
- FIG. 1 shown is a portion of a wireless communications network which will be used to describe an embodiment of the invention by way of example, featuring an access network 10 serving several wireless terminals 12 , only one shown.
- the access network 10 typically includes a number of base stations (not shown) each having a respective coverage area (not shown). The base stations may provide coverage in sectorized manner to increase frequency reuse.
- access network 10 is whatever equipment is required for the receipt and processing of the access attempts by a given wireless terminal, such as wireless terminal 12 .
- an embodiment of the invention provides an access channel set generally indicated by 15 of channels are made use of by wireless terminals in attempting to access the resources of the access network 10 , such as fundamental channels, supplemental channels, shared channels, etc.
- the access channel set 15 includes a subset of channels which will be referred to herein as the “Reverse Advanced Access Channel”, or R-AACH 11 .
- the R-AACH 11 is used by a wireless terminal 12 in a wireless cellular communications network to initiate communication with the access network 10 or to respond to a wireless terminal directed message.
- the R-AACH 11 consists of a Reverse Pilot Channel or R-PICH 16 transmitted by the wireless terminal 12 , and a Reverse Advanced Access Data Channel or R-AADCH 18 also transmitted by a wireless terminal.
- the access channel set 15 also involves interaction of two further channels, namely a forward shared power control channel, or F-SHPCCH 20 transmitted by the access network 10 in the coverage area of the access network within which the wireless terminal 12 is located, and a forward supplementary paging channel or F-SPCH 22 also transmitted by the access network 10 .
- F-SPCH is a broadcast channel, while the F-SHPCCH sends power control bits to specific wireless terminal in TDMA fashion, i.e. it sends a power control bit to a specific wireless terminal at one time and to another wireless terminal at another time, as described in detail below.
- access attempts are made by a wireless terminal 10 using the R-AACH 11 .
- the F-SHPCCH 20 is used to control the power of the R-AACH.
- the SHPCCH 20 also serves as an implicit signal for a wireless terminal 12 making the access attempt to go ahead with the transmission of a message part.
- the base station 10 broadcasts R-AACH related parameters in an advanced access parameters message on the F-SPCH 22 . While two channels from the base station 12 are provided in the preferred embodiment, more generally any number of channels (one or more) are required which are capable of providing the wireless terminal 10 with the required access parameters and the required power control information.
- AAP advanced access probe
- An advanced access probe has a preamble followed by an access request mini-message which is then followed by actual access data.
- the preamble is a non-data bearing portion of the advanced access probe sent by the wireless terminal 10 to assist the base station 12 in initial acquisition and channel estimation.
- only the R-PICH 16 is transmitted.
- a long code associated with the time (and equivalently with the advanced access subchannel used or the attempt) at which the wireless terminal is mating the access attempt is applied to a short code PN sequence.
- both the R-PICH 16 and the R-AADCH 18 are used.
- the transmit power of the wireless terminal 10 is controlled by the base station 12 via the F-SHPCCH 20 .
- the R-PICH 16 is also used to transmit power control commands to the base station during the access request mini-message and data message as described in further detail below.
- the initial preamble consists only of the R-PICH 16 ; this is followed by a request mini-message during which R-PICH 16 transmissions occur, and transmissions on the R-AADCH 18 at 9.6 kbps occur for 2.5 ms; this is followed by access data during which R-PICH 16 is being transmitted, and the R-AADCH 18 is transmitting at one of the following rates: 9.6 kbps, 19.2 kbps or 38.4 kbps.
- a frame duration of 20 ms is employed.
- the R-AACH 11 preferably uses a random-access protocol. The random-access protocol is used in CDMA systems to deal with the collisions of the access probes initiated by multiple wireless terminals. If the access attempt is not successful, the wireless terminal will back off for a back off time, the back off time being randomly generated by the wireless terminal, and then try its access probe again after the random back off time.
- the access network 10 After the preamble is acquired by the access network 10 , immediately the access network 10 starts transmitting power control commands on the F-SHPCCH 20 to control the power of the wireless terminal 12 which is making the advanced access probe.
- the wireless terminal 12 looks for these power control commands and treats them as an implicit acknowledgement of the advanced access probe.
- the accessing wireless terminal 12 Upon reception of acknowledgement from the access network 10 that the preamble is acquired (i.e. upon detection of power control commands being sent from the access network to the wireless terminal 12 in respect of the advanced access probe), the accessing wireless terminal 12 sends an access request mini-message on the R-AADCH 18 , preferably at a fixed rate of 9.6 kbps.
- the R-AACH 11 has defined for it an associated set of transmission slots defined in detail below.
- the wireless terminal 12 uses one of the transmission slots by using a long code mask associated with the transmission slot and uses this mask until transmission of the advanced access probe is complete.
- the long code mask is a 42 bit long code mask which is applied to the AACH.
- the long code mask has a time-dependent field which in one embodiment can take a value from 0 to 5 thereby providing six reverse advanced access subchannels (R-AASCHs). This allows up to 6 overlapping AACH probes each starting at a different time offset.
- the access channel slot duration is preferably chosen such that there is no long code overlap. This requires that the slot duration multiplied by the number of R-AASCHs must be greater than the maximum probe duration.
- bits M 41 through M 33 are preferably set to a fixed sequence, for example ‘110001011’ which identifies the long code mask to be that of the advanced access channel; bits M 32 through M 28 are set to the Advanced Access Channel number; bits M 27 through M 25 are set to the time-dependent SLOT_OFFSET field; bits M 24 through M 9 are set to a BASE_ID for a current base station (the base station which transmitted the access channel parameters received by the wireless terminal 12 prior to making the access attempt); and bits M 8 through M 0 are set to the PN offset of the current base station.
- the five bits M 28 -M 32 may be used to identify one of multiple advanced access channels, and the three bits M 25 to M 27 identify a subchannel on the advanced access channel thus identified. Different numbers of bits used for the access channel identifier and for the advanced access subchannel identifier would change the number of advanced access channels, and/or the number of advanced access subchannels which could be identified using the scheme.
- the Advanced Access Channel probe duration is (AACH_PREAMBLE_DURATION (the duration of the preamble of the advanced access probe)+request mini-message duration +AACH_DATA_DURATION (the duration of the data portion of the advanced access probe) all preferably in 1.25 ms units.
- Wireless terminals are assumed to have an accurate representation of system time.
- the total probe duration that includes preamble (AACH_PREAMBLE_DURATION), request mini-message length (fixed), and the data message duration (AACH_DATA_DURATION).
- AACH_SLOT_DURATION 16;
- NUM_AACH_OFFSET 4;
- AACH_PREAMBLE_DURATION 16;
- AACH_DATA_DURATION 46.
- Access probes can start at system times which are integer multiples of the access channel offset.
- the “offset” field of long code mask of FIG. 2 is computed from the above information as follows:
- floor (t / AACH_SLOT _DURATION) mod NUM_AACH_OFFSET where floor(x) is the largest integer which is smaller than or equal to x.
- FIG. 3 shows how the advanced access subchannels would be separated in time for the above example parameters.
- the long code used by a wireless terminal transmitting on this access subchannel will identify the subchannel as being the first subchannel by an appropriate setting of the time dependent part (see FIG. 2).
- the long code used by a wireless terminal transmitting on this access subchannel will identify the subchannel as being the second subchannel by an appropriate setting of the time dependent part.
- the long code used by a wireless terminal transmitting on this access subchannel will identify the subchannel as being the third subchannel by an appropriate setting of the time dependent part.
- advanced access probes using the fourth advanced access subchannels will have a slot offset of three and will last for 64 1.25 ms units as indicated generally by 36 .
- the long code used by a wireless terminal transmitting on this access subchannel will identify the subchannel as being the first subchannel by an appropriate setting of the time dependent part.
- FIG. 4 summarizes in detail the Advanced Access Channel modulation parameters for spreading rate 1 .
- Spreading rate 1 is 1.2288 Mcps (1.25 MHz channel).
- Each advanced access subchannel is associated with a respective shared power control subchannel transmitted as part of the F-SHPCCH ( 20 of FIG. 1).
- a respective shared power control subchannel transmitted as part of the F-SHPCCH 20 of FIG. 1.
- the Shared Power Control Channel (F-SHPCCH) is used by the base station to transmitting power control commands for the power control of each subchannel of the R-AACH as well as to indicate an implicit acknowledgement to the preamble and request parts of an advanced access probe.
- Multiple shared power control subchannels (SHPCSCH) are time multiplexed on the SHPCCH.
- SHPCSCH shared power control subchannels
- the channel structure for the Shared Power Control Channel is the same as the Forward Common Power Control Channel structure provided in IS-2000A.
- FIG. 9 shows a detailed example implementation.
- the SHPCCH is spread with Walsh code W33512.
- the subchannel positions are randomized with respect to time so that higher power PC bits do not consistently and systematically coincide.
- a long code mask such as indicated in FIG. 5 is employed.
- the long code mask contains a three bit field, in the illustrated example bits 26 to 28 set to 101 , which is unique to the F-SHPCCH.
- the power control commands are sent on the F-SHPCCH 20 that is designated for the R-AACH 11 .
- An example of this one-to-one relationship is shown in FIG. 3 for the previously described parameter set example.
- Access data is transmitted on the reverse Advanced Access Data Channel (R-AADCH 18 of FIG. 1) at a fixed data rate of 9.6, 19.2 or 38.4 kbps upon receiving this implicit acknowledgement from the base station.
- the data rate is based on what the base station is broadcasting as allowable rates and the size of the message.
- the frame duration for the Advanced Access data on the Advanced Access Channel may be 20 ms in duration.
- the Advanced Access Data Channel preferably is spread with an 8-ary Walsh cover. More specifically, the Walsh cover (++ ⁇ ++ ⁇ ) is preferably used.
- the access data may be a message requesting a resource or user data (such as a short message) to be passed on to a defined destination.
- the procedure for the wireless terminal to initiate the advanced access will now be described with reference to the flowchart of FIG. 6.
- the advanced access probe might be initiated by a user pressing a “call” button on the wireless terminal for example.
- step 6 - 1 when the wireless terminal acquires the synchronization with the base station through the forward link SYNC channel, it selects an advanced access subchannel as a function of the time at which the advanced access probe was initiated. The advanced access subchannel starting on the next slot boundary is selected.
- the wireless terminal begins to transmit the access preamble using the selected advanced access subchannel and at the same time monitors the energy of the shared power control subchannel associated with the selected advanced access subchannel.
- step 6 - 3 if sufficient energy in the shared power control subchannel is detected, (for example if the energies in three consecutive PCBs (power control bits) are above a threshold), the wireless terminal knows that its preamble was acquired by the base station and goes to step 6 - 5 . On the other hand, if insufficient energy detected (for example if for a certain time, no energies in three consecutive PCBs are above the threshold), the wireless terminal knows that its access request was not acquired and/or granted by the base station and goes back to step 6 - 1 , having aborted that particular access attempt, after applying a random back off time (delay) in step 6 - 4 . Also, at step 6 - 3 , the wireless terminal uses the power control commands received on the shared power control subchannel to control the power of the transmission of the preamble portion of the advance access probe.
- the wireless terminal uses the power control commands received on the shared power control subchannel to control the power of the transmission of the preamble portion of the advance access probe.
- the wireless terminal begins to transmit the request mini-message followed by the user data packet and preferably also begins to transmit power control commands on the reverse pilot channel to start power controlling the shared power control subchannel. During this transmission, the wireless terminal continues to monitor the energy of the shared power control subchannel and will abort the transmission (and return to step 6 - 1 ) if power control commands cease to be received, for example, it the energies in three consecutive PCBs are below the threshold. Also, the wireless terminal uses the power control commands received on the shared power control subchannel to control the power of the transmission of the request and data portions of the advance access probe.
- the request mini-message is sent at 9.6 kbps and lasts for 2.5 ms, and the message fields are as follows:
- a first user wireless terminal initiates an advanced access probe generally indicated by 50 on the first advanced access subchannel, labelled AACH_ 1 .
- AACH_ 1 To would need to be one of the times at which an advanced access probe on the first advanced access subchannel is allowed to start. Shown are time intervals during which the preamble 52 , request 54 and data portions 56 of the advanced access probe are transmitted.
- F-SHPCCH the forward shared power control channel
- SHPCCH- 1 62 is the shared power control subchannel for the first advanced access subchannel.
- SHPCCH- 1 is active which serves as an acknowledgement of the preamble.
- the SHPCCH- 1 remains active, and the first advanced access probe's request is granted.
- a second user wireless terminal initiates an advanced access probe generally indicated by 70 on the second advanced access subchannel, labelled AACH_ 2 .
- T 1 would need to be one of the times at which an advanced access probe on the second advanced access subchannel is allowed to start. Shown are time intervals during which the preamble 72 , request 74 and data portions 76 of the advanced access probe are transmitted.
- SHPCCH- 2 64 is the shared power control subchannel for the second advanced access subchannel. Before the end of the preamble 72 of the advanced access probe, SHPCCH- 2 is active which serves as an acknowledgement of the preamble. However, during the data transmission, the SHPCCH- 2 goes inactive indicating that the request is denied. The transmission is aborted at that time.
- the wireless terminal may monitor the energy of the shared power control subchannel associated with the selected Advanced Access subchannel. If there is energy measured in the shared power control subchannel, the wireless terminal will know that this channel is being used by an another wireless terminal. The wireless terminal would then wait a random back off time before trying again.
- FIG. 8 is an example implementation of the AACH channel structure.
- FIG. 9 is an example implementation of the SHPCCH channel structure which is based on the structure of the IS2000A CPCCH (common power control channel).
- there are 2N (N 12, 24, 48) common power control subchannels, numbered from 0 through 2N - 1, in one common power control group of the Common Power Control Channel. These are divided equally between the I arm and the Q arm of the Common Power Control Channel.
- the MUX blocks 100 , 102 in FIG. 9 are used to time division multiplex the N power control bits for the I arm or Q arm. The positions of the N power control bits are randomized by a randomizer 104 . After signal mapping 106 , 108 and gain adjustment 112 , 114 the power control bits are spread by a Walsh function 116 and then fed through a complex multiplier 118 .
- a three state power control bit is used on the SHPCCH to control the R-AACH.
- the power control bits sent to a given wireless terminal are the normal two state bits until after their acknowledgement function is complete, i.e. after acknowledgement of the request message.
- the three state power control bits can be also used to control the power of reverse data and voice channels such as Fundamental Channels (R-FCH) and Supplemental Channels (R-SCH).
- R-FCH Fundamental Channels
- R-SCH Supplemental Channels
- a medium value is added to the reverse link power control bit (PCB).
- the power ratio remains constant meaning that if a power control bit is being applied to multiple channels, the power of all channels is adjusted by an equal amount.
- a subset of the power control bits for example one of every 64 power control bits, are allocated to serve as a relative gain adjustment bit which adjusts the relative amount by which the power of one or more channels is adjusted compared to the pilot channel.
- the relative gain adjustment bit may be used to control the relative gain applied to the supplementary channel compared to the pilot channel. Multiple such “relative gain adjustment channels” may be provided.
- FIG. 10 shows details of the use of the three value power control bit.
- the base station transmits +1 (actually a 0 or a 1) to instruct an increase in power, ⁇ 1 (actually a 1 or a 0) to instruct a decrease in power, and transmits a 0 (transmits zero energy by setting the gain of the PCB bit to zero so that no energy is transferred to the PCB) to instruct no change in the power.
- the wireless terminal begins to transmit power control commands to the base station on a pilot channel transmitted by the wireless terminal to control the power of the shared power control subchannel on the forward link, for example as per power control bits transmitted in 1xRTT to power control the forward traffic channel.
- the power control subchannel will have its gain adjusted based on channel estimates reported by the wireless terminal.
- the power control commands transmitted to the base station are two state power control commands.
- Threshold_High and Threshold_Low are established for the wireless terminal in respect of the power control bits received.
- Threshold_High When a received value of a power control bit is greater than Threshold_High, the wireless terminal will increase the output power; when the a received value of a power control bit is smaller than Threshold_Low, the wireless terminal will decrease the output power; and when the detected power is between the Threshold_High and Threshold_Low, the wireless terminal will not change the output power.
- the thresholds are preferably dynamically determined as a function of a signal to Noise ratio estimated by the wireless terminal.
- the received values of the power control bits are real values.
- one of every 64 PCB is a relative gain adjustment.
- the bit will have 3 values as well. The value of this bit will be determined by the measurement of CRC and the energy of the channels.
- a “1” in this relative gain adjustment bit will indicate to the wireless terminal to increase the reverse supplemental channel gain (relative to the reverse pilot channel gain) by a certain amount.
- a “0” indicates no change in the reverse supplemental channel gain (relative to the reverse pilot channel gain),
- a “ ⁇ 1” indicates to the wireless terminal to decrease the reverse supplemental channel gain (relative to the reverse pilot channel gain) by a certain amount.
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- 2006-10-13 US US11/580,024 patent/US7760698B2/en not_active Expired - Lifetime
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2012
- 2012-06-28 US US13/536,185 patent/US8897124B2/en not_active Expired - Fee Related
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US6967935B1 (en) * | 1999-08-17 | 2005-11-22 | Samsung Electronics Co., Ltd. | Apparatus and method for access communication in CDMA communication system |
US20040258035A1 (en) * | 2003-06-19 | 2004-12-23 | Mingxi Fan | Method and apparatus for dynamic adjustment of rise-over-thermal (ROT) threshold for reverse link rate allocation |
US7525909B2 (en) * | 2003-06-19 | 2009-04-28 | Qualcomm Incorporated | Method and apparatus for dynamic adjustment of rise-over-thermal (ROT) threshold for reverse link rate allocation |
US8369861B2 (en) | 2003-07-03 | 2013-02-05 | Panasonic Corporation | Base station and mobile station communicating with OFDM system using a plurality of subcarriers and communication method with OFDM system using a plurality of subcarriers |
US20060153061A1 (en) * | 2003-07-03 | 2006-07-13 | Matsushita Electric Industrial Co. Ltd | Multi-carrier communication device and feedback information communication method |
US8170571B2 (en) | 2003-07-03 | 2012-05-01 | Panasonic Corporation | Base station and mobile station communicating with OFDM system using a plurality of subcarriers and communication method with OFDM system using a plurality of subcarriers |
US8032144B2 (en) * | 2003-07-03 | 2011-10-04 | Panasonic Corporation | Multi-carrier communication device and feedback information communication method |
US7565152B2 (en) | 2003-07-31 | 2009-07-21 | Alcatel-Lucent Usa Inc. | Method of controlling overload over the reverse link |
US20050026624A1 (en) * | 2003-07-31 | 2005-02-03 | Gandhi Asif D. | Method of controlling overload over the reverse link |
AU2004306342B2 (en) * | 2003-10-08 | 2007-11-22 | Samsung Electronics Co., Ltd. | System and method for dynamic allocation and simultaneous operation of forward packet data and supplemental channels in EV-DV network |
WO2005034453A1 (en) * | 2003-10-08 | 2005-04-14 | Samsung Electronics Co., Ltd. | System and method for dynamic allocation and simultaneous operation of forward packet data and supplemental channels in ev-dv network |
US7570970B2 (en) * | 2004-09-13 | 2009-08-04 | Panasonic Corporation | Mobile station device, and upstream circuit power control method |
US20080057994A1 (en) * | 2004-09-13 | 2008-03-06 | Matsushita Electric Industrial Co., Ltd. | Mobile Station Device, And Upstream Circuit Power Control Method |
US8036186B2 (en) * | 2006-07-26 | 2011-10-11 | Tropos Networks, Inc. | Adaptively setting transmission power levels of nodes within a wireless mesh network |
US20080025269A1 (en) * | 2006-07-26 | 2008-01-31 | Tropos Networks, Inc. | Adaptively setting transmission power levels of nodes within a wireless mesh network |
US8738063B1 (en) | 2008-10-24 | 2014-05-27 | Sprint Communications Company L.P. | Power control based on multi-antenna mode distribution |
US20100188987A1 (en) * | 2009-01-28 | 2010-07-29 | Agere Systems, Inc. | Power learning security in wireless routers |
US7948914B2 (en) * | 2009-01-28 | 2011-05-24 | Agere Systems Inc. | Power learning security in wireless routers |
US8364193B1 (en) | 2009-05-04 | 2013-01-29 | Sprint Communications Company L.P. | Forward link power control |
US8934499B1 (en) | 2011-02-25 | 2015-01-13 | Sprint Communications Company L.P. | Dynamically transferring between multiple-input and multiple-output (MIMO) transmit modes based on a usage level of a wireless access node |
US8526380B1 (en) | 2011-03-17 | 2013-09-03 | Sprint Communications Company L.P. | Dynamic transmission mode selection based on wireless communication device data rate capabilities |
Also Published As
Publication number | Publication date |
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CN1964229B (zh) | 2012-09-26 |
KR20030055289A (ko) | 2003-07-02 |
CN100490353C (zh) | 2009-05-20 |
ES2281049T3 (es) | 2007-09-16 |
EP1612969A1 (en) | 2006-01-04 |
US20070076678A1 (en) | 2007-04-05 |
BRPI0114892B1 (pt) | 2017-06-20 |
CN1964229A (zh) | 2007-05-16 |
WO2002035735A2 (en) | 2002-05-02 |
US20030067899A9 (en) | 2003-04-10 |
EP1612969B1 (en) | 2007-01-24 |
DE60134484D1 (de) | 2008-07-31 |
JP2004511995A (ja) | 2004-04-15 |
CN1481626A (zh) | 2004-03-10 |
JP4309129B2 (ja) | 2009-08-05 |
US20120269052A1 (en) | 2012-10-25 |
US8248912B2 (en) | 2012-08-21 |
US7760698B2 (en) | 2010-07-20 |
EP1332568A2 (en) | 2003-08-06 |
WO2002035735A3 (en) | 2003-01-09 |
ATE352911T1 (de) | 2007-02-15 |
AU2002213703A1 (en) | 2002-05-06 |
DE60126368D1 (de) | 2007-03-15 |
US8897124B2 (en) | 2014-11-25 |
EP1332568B1 (en) | 2008-06-18 |
US20020105929A1 (en) | 2002-08-08 |
BR0114892A (pt) | 2004-07-06 |
KR100877447B1 (ko) | 2009-01-07 |
DE60126368T2 (de) | 2007-11-29 |
US20060209674A1 (en) | 2006-09-21 |
ATE398864T1 (de) | 2008-07-15 |
US7154846B2 (en) | 2006-12-26 |
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