Christopher Gerard Lott - San Diego CA, US Jean Au - San Diego CA, US Rashid Ahmed Akbar Attar - San Diego CA, US Peter J. Black - San Diego CA, US Mingxi Fan - San Diego CA, US Naga Bhushan - San Diego CA, US
Assignee:
Qualcomm, Inc. - San Diego CA
International Classification:
H04B 7/00 H04Q 7/20
US Classification:
455522, 455 6711, 375355, 375360, 370318
Abstract:
A method and apparatus for determining the data rate of a reverse link communication of an access terminal includes receiving a reverse activity bit (RAB) from an access network in the communication system, and passing the RAB to multiple digital filters to produce filtered RABs. The reverse link data rate is determined based on these filtered values of the RABs. From the filtered RAB values a continuous fluid power level is determined each rate update. The access terminal maps the continuous fluid power level to actual physical transmissions by dithering among discrete power levels allowed by the physical layer.
Adaptive Data Rate Determination For A Reverse Link Communication In A Communication System
A method and apparatus for determining the data rate of a reverse link communication of an access terminal includes receiving a reverse activity bit (RAB) from an access point in the communication system, and passing the RAB to a digital filter to produce a filtered RAB. In one embodiment, the reverse link data rate is determined based on the filtered value of the RAB. Furthermore, a processor in the access terminal may determine whether the access terminal is in an idle mode, and passing a non-busy state value of the RAB to the digital filter when the access terminal is in the idle mode. The filtered RAB may be compared to a threshold to determine a mode of reverse link data rate determination. The mode defines a set of criteria for an aggressiveness level of increasing or decreasing the reverse link communication data rate. The processor, therefore, determines the data rate based on the filtered reverse activity bit in accordance with the determined mode.
Method And Apparatus For Data Transmission On A Reverse Link In A Communication System
Christopher Gerard Lott - San Diego CA, US Jean Put Ling Au - San Diego CA, US
Assignee:
Qualcomm Incorporated - San Diego CA
International Classification:
H04Q 7/00
US Classification:
370332, 370333
Abstract:
Systems and methods for decreasing delays and thereby improving the performance of data transmissions in wireless communication systems by enabling increased data transmission rates to be selected for a reverse link between an access terminal and an access network. The new data rate is selected from several limiting rates, including a data-justified rate and a ramp-up-limited rate. In one embodiment, the data-justified rate is constrained to decrease in a controlled manner and cannot suddenly drop to 0. In another embodiment, the ramp-up-limited rate is allowed to return quickly to a sticky rate if the system is not busy rather than having to ramp up to the sticky rate according to the standard probabilities.
Reverse Link (RL) data rate allocation in a High Data Rate (such as 1xEV-DO) system as a function of Forward Link (FL) channel quality. Rate shaping of a throughput profile for multiple Access Terminals (ATs) is performed by adjusting transition probabilities associated with a data rate allocation algorithm. The transition probabilities are adjusted to encourage transitions in a desired direction. In one embodiment, the transition probabilities are adjusted as a function of the FL Signal to Interference and Noise Ratio Ratio (SINR), such as measured per serving sector or as a captured sum total of FL SINR. In another embodiment, the transition probabilities are adjusted as a function of the historical loading condition of the system. In still another embodiment, the transition probabilities are adjusted as a function of differences in rise-over-thermal values between neighboring sectors.
Reverse Link (RL) data rate allocation in a High Data Rate (such as 1xEV-DO) system as a function of Forward Link (FL) channel quality. Rate shaping of a throughput profile for multiple Access Terminals (ATs) is performed by adjusting transition probabilities associated with a data rate allocation algorithm. The RL maximum data rate per AT is adjusted to reduce the loading in a designated area and result in rate shaping of the cell and/or sector. In one embodiment, the maximum data rates are adjusted as a function of the FL Signal to Interference and Noise Ratio (SINR), such as measured per serving sector or as a captured sum total of FL SINR. In still another embodiment, the maximum data rates are adjusted as a function of differences in rise-over-thermal values between neighboring sectors.
Peter J. Black - San Diego CA, US Jun Ma - San Diego CA, US Eduardo Esteves - Sao Paulo, BR Christopher Gerard Lott - San Diego CA, US
Assignee:
QUALCOMM Incorporated - San Diego CA
International Classification:
H04B 7/00 H04B 7/216 H04W 4/00
US Classification:
370335, 370310, 370329
Abstract:
An Access Network (AN) can send an acknowledge message (ACK) to an Access Terminal (AT) to indicate that the AN has successfully decoded the data received in the first set of slots of the first data packet. The AN can send a negative acknowledge message (NAK) to the AT to indicate that the AN has not successfully decoded the data received in the first set of slots of a first data packet. Based upon receipt of the NAK, the AT can resend the data by sending a second set of slots of the first data packet containing redundant data. Based upon receipt of the ACK, the AT can send a first set of slots of another packet. The AT can gate off for a predetermined period of time after sending the first set of slots of a first packet and before sending a next set of slots.
Apparatus And Method For Controlling Reverse Link Interference Among Access Terminals In Wireless Communications
Jean Put Ling Au - San Diego CA, US Christopher Gerard Lott - San Diego CA, US Naga Bhushan - San Dieog CA, US Rashid Ahmed Akbar Attar - San Diego CA, US
Assignee:
QUALCOMM Incorporated - San Diego CA
International Classification:
H04B 7/00 H04Q 7/20
US Classification:
455522, 455 111, 455 68, 455 69
Abstract:
In a wireless communication system, an apparatus and a method are provided for controlling reverse link interference among access terminals that are power controlled by a sector of a base station. In an embodiment, the maximum effective noise power spectral density is used as a parameter for controlling the level of reverse link loading, by setting a reverse activity bit (RAB) to signal the access terminals to reduce their data rates in order to minimize interference between the access terminals if the maximum effective noise power spectral density is above a predetermined threshold.
Apparatus And Method For Controlling Reverse Link Interference Among Access Terminals In Wireless Communications
Jean Put Ling Au - San Diego CA, US Christopher Gerard Lott - San Diego CA, US Naga Bhushan - San Diego CA, US Rashid Ahmed Akbar Attar - San Diego CA, US
Assignee:
QUALCOMM Incorporated - San Diego CA
International Classification:
H04B 7/00
US Classification:
455522, 455 69
Abstract:
In a wireless communication system, an apparatus and a method are provided for controlling reverse link interference among access terminals that are power controlled by a sector of a base station. In an embodiment, the maximum effective noise power spectral density is used as a parameter for controlling the level of reverse link loading, by setting a reverse activity bit (RAB) to signal the access terminals to reduce their data rates in order to minimize interference between the access terminals if the maximum effective noise power spectral density is above a predetermined threshold.
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