14-05-2020 дата публикации
Номер: US20200153671A1
Принадлежит:
A wireless device, a Radio Access Network (RAN) node, and various methods are described herein for improving the coverage performance of the Extended Coverage (EC)-Random Access Channel (RACH). For instance, the wireless device, the RAN node, and various methods can improve the coverage performance of the EC-RACH by utilizing a new access burst (referred to herein as Extended Synchronization Access Burst (ESAB)), a new coding scheme (referred to herein as RACH11′) for the CC5 2TS EC-RACH, and/or an access burst mapping scheme for the CC5 2TS EC-RACH. 1. A wireless device configured to communicate with a Radio Access Network (RAN) node , the wireless device comprising:a processor; and, 'attempt a system access using an Extended Coverage Random Access Channel (EC-RACH) by transmitting, to the RAN node, a system access message on the EC-RACH using repeated Extended Synchronization Access Bursts (ESABs), wherein each ESAB has 102 encrypted data bits coded according to an 11-bit Random Access Channel (RACH) coding scheme which utilizes 11 payload bits and 6 parity bits to which a rate 1/6 tail biting convolutional coding is applied resulting in the 102 encrypted data bits after channel coding.', 'a memory that stores processor-executable instructions, wherein the processor interfaces with the memory to execute the processor-executable instructions, whereby the wireless device is operable to2. The wireless device of claim 1 , wherein each ESAB comprises 140 synchronization bits claim 1 , the 102 encrypted data bits claim 1 , 3 tail bits claim 1 , and 68 guard symbols.3. The wireless device of claim 1 , wherein the rate 1/6 tail biting convolutional coding utilizes the following polynomials:{'br': None, 'i': G', 'D', 'D', 'D', 'D, '4=1+2+3+5+6;'}{'br': None, 'i': G', 'D', 'D', 'D', 'D, '4=1+2+3+5+6;'}{'br': None, 'i': G', 'D+D', 'D', 'D, '7=1+2+3+6;'}{'br': None, 'i': G', 'D+D', 'D, '5=1+4+6;'}{'br': None, 'i': G', 'D+D', 'D', 'D', 'D, '6=1+2+3+4+6; and'}{'br': None, 'i': ...
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