How we get RA RNTI

“5.1.4 Random Access Response reception" in "TS36.321” says how to calculate RA_RNTI as follows.

The RA-RNTI associated with the PRACH in which the Random Access Preamble is transmitted, is computed as:

RA-RNTI = 1 + t_id + 10 * f_id

Where t_id is the index of the first subframe of the specified PRACH (0 <≤ t_id <10), and f_id is the index of the specified PRACH within that subframe, in ascending order of frequency domain (0≤ f_id< 6).

For FDD, f_id is fixed as 0.

Therefore, RA_RNTI is decided by the sending timing (SubFrame) of PRACH Preamble by UE. It means that (the subframe number (number between 0000~0009) of PRACH transmission + 1) is RA-RNTI.

It means that UE specifies RA_RNTI by the sending timing (SubFrame) of PRACH Preamble.

转载自：http://www.sharetechnote.com/html/RACH_LTE.html#How_can_we_get_RA_RNTI

本文来自互联网用户投稿，文章观点仅代表作者本人，不代表本站立场，不承担相关法律责任。如若转载，请注明出处。 如若内容造成侵权/违法违规/事实不符，请点击【内容举报】进行投诉反馈！