Patent EP1081876A2 successfully refreshed from Google Patents.
EP1081876A2
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EP
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Method and system for controlling forward transmit power in a wireless system
Assignee: Nokia of America Corp
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Filing: 2000-08-29
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Granted: —
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Expires: 2020-08-29
Abstract
Abstract A method and system for controlling downlink transmit power during a soft hand-off in a spread-spectrum wireless system supports independent power control of multiple forward channels to reduce fading. For a soft hand-off, a mobile switching center determines if a forward control channel is transmitted from different sectors of base stations than a forward data channel is. The base stations preferably adjust transmit powers of the forward channels grouped into different physical channels by receiving power control data over the allocated reverse power control channels to compensate for fading of the forward channels during a soft hand-off.
Inventors
- 👤 Raafat Edward Kamel
- 👤 Wen-Yi Kuo
- 👤 Martin Howard Meyers
- 👤 Carl Francis Weaver
- 👤 Xiao Cheng Wu
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-24 22:00
CPC Classifications
H; H04; H04W; H04W52/00; H04W52/04; H04W52/38; H04W52/50; H04W52/06; H04W52/14; H04W52/12; H04W52/146; H04W52/40
Claims Analysis
Total Claims: 32
Claim 1
Independent Claim
82 words
A method for controlling downlink transmit power in a wireless
system, the method comprising: instructing allocation of multiple reverse power control channels if the
forward control channel is transmitted from a different set of sectors than a
forward data channel, associated with the forward control channel, and if
base stations associated with the forward control channel are participating
in a soft hand-off; and adjusting transmit powers of the forward channels based on the
reverse power control channels associated with the forward channels.
Claim 2
Dependent Claim
42 words
The method according to claim 1 wherein the instructing step
comprises determining if active control sectors of the forward control
channel are different in number from at least one active data sector of the
forward data channel participating in the soft hand-off.
Claim 3
Dependent Claim
42 words
The method according to claim 1 wherein the instructing step
comprises determining if active control sectors of the forward control
channel are different in identity from at least one active data sector of the
forward data channel participating in the soft hand-off.
Claim 4
Dependent Claim
47 words
The method according to claim 1 wherein the instructing step
comprises determining a number of the reverse power control channels
based on a total number of different forward physical channels, each
forward physical channel associated with at least one corresponding pilot
code representing one of said sectors.
Claim 5
Dependent Claim
36 words
The method according to claim 1 wherein the adjusting step
comprises adjusting the transmit power of the data channel independently
from the transmit power of the control channel serving the mobile station
during the soft hand-off.
Claim 6
Dependent Claim
49 words
The method according to claim 1 wherein the instructing step
comprises instructing multiple reverse power control channels over separate
channels, each separate channel defined by bit robbing to provide a
channel with a transmission capacity of 400 bits per second to 800 bits per
second to compensate for fading.
Claim 7
Dependent Claim
32 words
The method according to claim 1 wherein the instructing step
comprises instructing multiple reverse power control channels over separate
channels, each separate channel defined by bit robbing from a reverse pilot
channel.
Claim 8
Dependent Claim
40 words
The method according to claim 1 wherein the adjusting step further
comprises the step of: maintaining multiple inner-loop power control schemes to control the
forward transmit power of different base stations participating in the soft
hand-off of the mobile station.
Claim 9
Independent Claim
109 words
A method for controlling downlink transmit power in a wireless
system, the method comprising: instructing the allocation of multiple reverse power control channels if
a forward control channel is transmitted in association with a different set of
pilot code offsets than a forward data channel, associated with the forward
control channel, and if base stations associated with the forward control
channel are participating in a soft hand-off; and determining a number of the reverse power control channels based
on a total number of distinct physical channels associated with the different
sets of pilot code offsets of the forward channels, where the physical
channels are realized by the base stations.
Claim 10
Dependent Claim
51 words
The method according to claim 9 wherein the instructing step
further comprises defining different sets of pilot code offsets, including a full
set of pilot code offsets and at least one reduced set, with a lesser number
of pilot code offsets than the full set, for participation in the soft hand-off.
Claim 11
Dependent Claim
58 words
The method according to claim 9 wherein the determining step
comprises requiring at least two power control channels if the forward
control channel is simulcasted and associated with a full set of pilot code
offsets and if the data channel is associated with a reduced set. with a
lesser number of pilot code offsets than the full set.
Claim 12
Dependent Claim
72 words
The method according to claim 9 wherein determining step
comprises requiring at least three power control channels if the forward
control channel is simulcasted and associated with a full set of pilot code
offsets, if a first data channel is associated with first reduced set, and if a
second data channel is associated with a second reduced set having at
least one different constituent pilot code offset from the first reduced set.
Claim 13
Dependent Claim
131 words
The method according to claim 9 further comprising the steps of: receiving different physical downlink channels associated with
corresponding distinct pilot sets of the pilot code offsets serving the mobile
station during the soft hand-off; allocating a target signal parameter value associated with each
distinct pilot set of pilot code offsets received at the mobile station; measuring a received signal parameter at the mobile station during
the soft hand-off for each distinct pilot set of pilot code offsets; comparing the measured signal parameter to the target signal
parameter value for each distinct pilot set of pilot code offsets; and transmitting power adjustment data over the multiple power control
channels based on the comparison between the target signal parameter
value and its corresponding measured signal parameter value for each
distinct pilot set.
Claim 14
Dependent Claim
52 words
The method according to claim 9 further comprising determining a
number of reverse power control channels based on a total number of
distinct physical channels associated with corresponding distinct sets of
pilot code offsets, where the physical channels are associated with a
plurality of base stations participating in the same soft hand-off.
Claim 15
Dependent Claim
28 words
The method according to claim 14 wherein the physical channels
include a data physical channel for the data channel and a control physical
channel for the control channel.
Claim 16
Independent Claim
117 words
A method for controlling downlink transmit power in a spread-spectrum
wireless system, the method comprising: determining if a new pilot channel is to be added to service a forward
control channel for a mobile station; placing the forward control channel in a soft hand-off mode and
determining whether an affiliated forward data channel, affiliated with the
control channel, is placed into the soft hand-off mode; receiving at least one reverse power control channel for the control
channel and its affiliated data channel; and adjusting the forward transmit powers of the forward channels based
on any distinct pilot sets of pilot codes by sending power control data over
the at least one of the reverse power control channels.
Claim 17
Dependent Claim
40 words
The method according to claim 16 wherein the determination of
whether the data channel is placed into the soft hand-off mode is based
upon available channel capacity at base stations participating in the soft
hand-off mode for the mobile station.
Claim 18
Dependent Claim
50 words
The method according to claim 16 wherein the determination
whether a data channel is placed into the soft hand-off mode is based upon
an interference reduction goal of using a lesser number base stations for
the forward data channel than a simulcasted control channel participating in
the soft hand-off mode.
Claim 19
Dependent Claim
36 words
The method according to claim 16 further comprising the step of: opting the data channel out of the soft hand-off mode and
reestablishing the data channel after the soft hand-off mode terminates for
the mobile station.
Claim 20
Dependent Claim
31 words
The method according to claim 16 further comprising the step of: re-establishing the data channel when an active set size equals one
after the soft hand-off mode of the mobile station.
Claim 21
Dependent Claim
35 words
The method according to claim 16 wherein the determining step
comprises providing the new pilot channel to service the control channel
based on the measured signal parameters of the neighbor set at the mobile
station.
Claim 22
Dependent Claim
119 words
A communications system for controlling downlink transmit power,
the communications system comprising: a switching center for determining if a forward control channel, for
affiliation with a forward data channel of a mobile station, is participating in
a soft hand-off; a receiver of a base station for receiving at least one reverse power
control channel based on a total number of distinct pilot sets of pilot codes
associated with said forward channels; a downlink power controller of the base station for adjusting the
forward transmit powers of any of the distinct pilot sets of pilot codes
independently by sending power control data over the at least one of the
power control channels to compensate for fading of the forward channels.
Claim 23
Dependent Claim
43 words
The system according to claim 22 further comprising: a receiver of the base station for receiving data relating to multiple
inner-loop power control schemes to control the forward transmit power of
the base station participating in the soft hand-off of the mobile station.
Claim 24
Dependent Claim
36 words
The system according to claim 22 wherein the downlink power
controller is adapted to adjust the forward transmit powers of the base
stations on an active set-by- active set basis for each of the pilot sets.
Claim 25
Dependent Claim
117 words
A wireless communications system for controlling downlink
transmit power comprising: a switching center for determining whether an affiliated forward data
channel, affiliated with the forward control channel, is to be placed into a
soft hand-off mode upon placement the forward control channel in a soft
hand-off mode; a receiver for receiving at least one reverse power control channel for
the control channel and its affiliated data channel; and a power controller of the base station for adjusting the forward
transmit powers of the forward channels based on distinct pilot sets of pilot
codes by receiving power control data over the at least one of the reverse
power control channel to compensate for fading of the forward channels.
Claim 26
Dependent Claim
43 words
The system according to claim 25 wherein the switching center is
adapted to determine whether the data channel is placed into the soft hand-off
mode based upon available channel capacity at base stations
participating in the soft hand-off mode for the mobile station.
Claim 27
Dependent Claim
56 words
The system according to claim 25 wherein the switching center is
adapted to determine whether a data channel is placed into the soft hand-off
mode is based upon an interference reduction goal of using a lesser number
base stations for the forward data channel than the simulcasted forward
control channel participating in the soft hand-off mode.
Claim 28
Dependent Claim
47 words
The system according to claim 25 further comprising: memory associated with the mobile switching center for storing
packet data messages associated with opting the data channel out of the
soft hand-off mode and reestablishing the data channel after the soft hand-off
mode terminates for the mobile station.
Claim 29
Dependent Claim
44 words
The system according to claim 25 wherein the switching center
determines whether to add a new pilot channel to service the control
channel and engage in the soft hand-off mode based on the measured
signal parameters of the neighbor set at the mobile station.
Claim 30
Dependent Claim
84 words
A mobile station for controlling downlink transmit power during a
soft hand-off: a measurer for determining at least one relatively strong pilot channel
for a forward data channel and a forward control channel during a soft hand-off; a processor for establishing multiple power control channels based
on a total number of distinct pilot sets of pilot codes associated with the
forward channels; a transceiver for sending power control data over the established
multiple power control channels to compensate for fading of the downlink
signal.
Claim 31
Dependent Claim
52 words
The mobile station according to claim 30 wherein the distinct pilot
sets include a control pilot set for the forward control channel and a data
pilot set for the forward data channel, wherein the control pilot set and the
data pilot set each contain a different number of pseudo-random noise code
offsets.
Claim 32
Dependent Claim
52 words
The mobile station according to claim 30 wherein the distinct pilot
sets include a control pilot set for the forward control channel and a data
pilot set for the forward data channel, wherein the control pilot set and the
data pilot set each contain a different identity of pseudo-random noise code
offsets.
References Cited (Backward Citations)
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