NDLI: CPR: A CRC-based packet recovery mechanism for wireless networks

Content Provider	IEEE Xplore Digital Library
Author	Sheng-Shih Wang Shiann-Tsong Sheu Huei-Yu Lee Ting-Rong, O.
Copyright Year	2013
Description	Author affiliation: Dept. of Inf. Manage., Minghsin Univ. of Sci. & Technol., Hsinchu, Taiwan (Sheng-Shih Wang) \|\| Dept. of Commun. Eng., Nat. Central Univ., Jungli, Taiwan (Shiann-Tsong Sheu; Huei-Yu Lee; Ting-Rong, O.)
Abstract	In wireless networks, the cyclic redundancy check (CRC) technique often cooperates with retransmission schemes to achieve reliable transmission. However, too many retransmissions in error-prone wireless environments not only create potential latency but also limit the overall bandwidth capacity. In general, an erroneously received packet is likely to possess some useful information, by which receivers can derive the original packet from a number of erroneously received copies. This study proposes a CRC-based packet recovery (CPR) mechanism to determine the original packet by minimizing the number of retries per packet. The CPR mechanism only buffers the first erroneously received copy and maintains a bitmap vector to relax the buffer requirement to derive the positions of inconsistent bits from erroneous copies. Based on these bit positions, the CPR mechanism generates all candidate packets, one of which is likely to be the correct packet. This study also designs two architectures with different numbers of CRC encoders to implement the proposed CPR mechanism for evaluations and comparisons. Performance evaluation results confirm that the proposed CPR mechanism can significantly reduce unnecessary retransmissions and buffer space consumption, compared with the existing mechanisms. Results also show that different architectures reveal a tradeoff between hardware cost and processing delay.
Starting Page	321
Ending Page	326
File Size	361840
Page Count	6
File Format	PDF
ISBN	9781467359382
ISSN	15253511
e-ISBN	9781467359399
e-ISBN	9781467359375
DOI	10.1109/WCNC.2013.6554584
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2013-04-07
Publisher Place	China
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Receivers Clocks Random access memory Automatic repeat request Hardware Transmitters Bit error rate
Content Type	Text
Resource Type	Article

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