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Matched Legal Cases: ['art 15', 'art 15', 'art 16', 'art 16', 'art 16', 'art 16', 'art 16', 'art 16', 'application No. 200380101286', 'application No. 2003239577', 'art 16', 'art 11', 'art 11', 'art 11', 'art 16', 'application No. 200380105267', 'application No. 03734136', 'application No. 03759271', 'application No. 03759271', 'application No. 200380101286', 'Application No. 200380101286', 'application No, 03814391']

Patent US8023885 - Non-frequency translating repeater with downlink detection for uplink and ... - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inPatentsA non-frequency translating repeater (110, 210, 300) for use in a time division duplex (TDD) radio protocol communications system includes detection retransmission and automatic gain control. Detection is performed by detectors (309, 310) and a processor (313). Detection can be overridden by processor...http://www.google.com/patents/US8023885?utm_source=gb-gplus-sharePatent US8023885 - Non-frequency translating repeater with downlink detection for uplink and downlink synchronizationAdvanced Patent SearchPublication numberUS8023885 B2Publication typeGrantApplication numberUS 11/546,242Publication dateSep 20, 2011Filing dateOct 12, 2006Priority dateMay 13, 2004Fee statusPaidAlso published asCN1993904A, CN1993904B, EP1745567A2, EP1745567A4, US7233771, US20050254442, US20070066220, WO2005115022A2, WO2005115022A3Publication number11546242, 546242, US 8023885 B2, US 8023885B2, US-B2-8023885, US8023885 B2, US8023885B2InventorsJames A. Proctor, Jr., Kenneth M. Gainey, Faisal A. ShadOriginal AssigneeQualcomm IncorporatedExport CitationBiBTeX, EndNote, RefManPatent Citations (326), Non-Patent Citations (54), Referenced by (19), Classifications (16), Legal Events (4) External Links: USPTO, USPTO Assignment, EspacenetNon-frequency translating repeater with downlink detection for uplink and downlink synchronization
US 8023885 B2Abstract
RSSI _ ( n ) = 1 W ∑ t = n - W + 1 n RSSI ( n ) Equation ( 1 ) where W is the number of samples. The index n denotes the discrete time interval during which the RSSI signal 402 and 405 are sampled and can be set, for example, to a sampling period of 1/25th of the duration of the minimum T/R-TG of 5 μs in order to accurately determine the subframe timing. With a 5 μs minimum T/R-TG, the sampling frequency should be at a rate of 5.0 MHz. Alternatively, in order to emphasize more recent samples, a windowing function using an exponential forgetting factor can be used which can be expressed as:
λ = ⅇ - 1 f s t c Equation ( 3 ) The beginning of the downlink and the uplink frame is typically marked by a rise in the filtered RSSI values. Thus, one way to detect the start of a subframe is to look for several consecutive increases in the filtered RSSI. That is, if the sign associated with RSSI(n)− RSSI(n−1) is positive for several consecutive samples, then we know that we are at the beginning of a subframe. It is also known that the total duration of the frame is 5 ms, including the transmission gaps, and this knowledge can be used to validate the total length the two transmission gaps and the downlink and uplink subframes. Similarly, when the sign associated with RSSI(n)− RSSI(n−1) is negative for several consecutive samples, the end of a subframe is indicated.
s ( n + 1 ) = { ws ( n ) + ( 1 - w ) d ( n )  d ( n )  > 0 s ( n )  d ( n )  = 0 Equation ( 4 ) where d(n) is the direction in which the downlink subframe start timing is adjusted, and w is the memory factor associated with the start time s(n). It should be noted that d(n) is defined by the formula:
d ( n ) = - sign [ ∑ k = - N N - 1 f ( RSSI _ ( n + k ) , RSSI _ ( n + k - 1 ) ) ] Equation ( 5 ) where N is the number of samples to either side of the start timing of the frame, and
f ( a , b ) = { + 1 , b - a > threshold - 1 , else Equation ( 6 ) The threshold in Equation 6 should be large enough such that only significant increases in RSSI(n) associated with the start of a downlink subframe are assigned a positive value. With reference to FIG. 4, the threshold 403 can represent a baseline threshold value.
An active RF repeater is advantageous in comparison to a store-and-forward repeater because of improvements in delay, improvements in throughput, and reduction in complexity. Further, the integrity of data security schemes is maintained with an RF based repeater since no encryption keys are required resulting in reduced complexity and management. The delay of an RF repeater is under one micro-second and potentially several hundred nanoseconds, whereas the delay of a store-and-forward repeater is larger than the frame time, which is 5 ms for IEEE 802.16. An increase in delay of this magnitude is not tolerable for many delay sensitive applications. It will be appreciated that a bottleneck in the bit rate of the store-and-forward repeater arises in that the achieved bit rate is limited by the bit rate of the slowest point-to-point link. Since it is not always possible to place the repeater exactly half-way between the subscriber and base station, the improvement in throughput and range may be quite limited. Also, as indicated in Table 1, the improvements in the bit rate are the greatest for the smaller block sizes, and diminish for the larger block sizes. Because each packet needs to be sent twice, in the case of R=� 16-QAM and 64 QAM modulation the store-and-forward repeater may reduce the cell throughput. Lastly, a store and forward repeater is inherently more complex because of the additional processing which must take place in order to recover and retransmit the packet adding to the price of the repeater and increasing its power consumption. Practical limitation in the protocols related to security, Quality of Service (QoS), and cost of installation, and network management can prevent the widespread adoption of store and forward repeaters.
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