Power control arrangement for long term evolution time division duplex method and apparatus
First Claim
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1. An apparatus comprising:
- a measuring unit configured to measure attenuation from a plurality of sub-bands of a frequency spectrum in which a physical uplink control channel is being transmitted; and
a calculating unit configured to calculate a path loss measurement as an average of the measurement of said attenuation from each of the plurality of sub-bands of the frequency spectrum,wherein power control for said physical uplink control channel is calculated using the following formula;
P=min(Pmax,10 log 10(M)+Po+α
PL+Δ
mcs+f(Δ
j)),where Pmax is a maximum allowed user equipment power, M is a number of assigned resource blocks, α
is a path loss compensation factor, Po is a cell and user equipment specific scaling parameter, PL is the downlink path loss measured at the user equipment, Δ
mcs is MCS specific value, and f(Δ
i) is a user equipment specific closed loop correction value.
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Abstract
Embodiments of the present invention provide methods, systems and apparatuses for optimizing downlink path loss (PL) measurements in time division duplex (TDD) systems enabling fast power control targeting to decrease fading margin. In one embodiment, a method of power control in a long term evolution time division duplex (TDD) system is provided. The method includes controlling a length of a path loss measurement filter based on an allocation type. A width and frequency position of the path loss measurement filter is made dependent on the allocation type.
8 Citations
8 Claims
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1. An apparatus comprising:
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a measuring unit configured to measure attenuation from a plurality of sub-bands of a frequency spectrum in which a physical uplink control channel is being transmitted; and a calculating unit configured to calculate a path loss measurement as an average of the measurement of said attenuation from each of the plurality of sub-bands of the frequency spectrum, wherein power control for said physical uplink control channel is calculated using the following formula;
P=min(Pmax,10 log 10(M)+Po+α
PL+Δ
mcs+f(Δ
j)),where Pmax is a maximum allowed user equipment power, M is a number of assigned resource blocks, α
is a path loss compensation factor, Po is a cell and user equipment specific scaling parameter, PL is the downlink path loss measured at the user equipment, Δ
mcs is MCS specific value, and f(Δ
i) is a user equipment specific closed loop correction value. - View Dependent Claims (2, 3, 4)
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5. An apparatus comprising:
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measuring means for measuring attenuation from a plurality of sub-bands of a frequency spectrum in which a physical uplink control channel is being transmitted; and calculating means for calculating a path loss measurement as an average of the measurement of said attenuation from each of the plurality of sub-bands of the frequency spectrum, wherein power control for said physical uplink control channel is calculated using the following formula;
P=min(Pmax,10 log 10(M)+Po+α
PL+Δ
mcs+f(Δ
i)),where Pmax is a maximum allowed user equipment power, M is a number of assigned resource blocks, α
is a path loss compensation factor, Po is a cell and user equipment specific scaling parameter, PL is the downlink path loss measured at the user equipment, Δ
mcs is MCS specific value, and f(Δ
i) is a user equipment specific closed loop correction value. - View Dependent Claims (6, 7, 8)
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Specification
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Current AssigneeWSOU Investments, LLC (WSOU Holdings, LLC)
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Original AssigneeNokia Corporation
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InventorsTiirola, Esa Tapani, Skov, Peter, Pajukoski, Kari Pekka, Che, Xiang Guang
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Primary Examiner(s)Yuen, Kan
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Application NumberUS13/750,114Publication NumberTime in Patent Office459 DaysField of Search370/252, 370310-341US Class Current370/252CPC Class CodesH04W 24/02 Arrangements for optimising...H04W 52/04 TPCH04W 52/242 taking into account path lossH04W 52/325 Power control of control or...
