(19)
(11)EP 4 277 422 A3

(12)EUROPEAN PATENT APPLICATION

(88)Date of publication A3:
07.02.2024 Bulletin 2024/06

(43)Date of publication A2:
15.11.2023 Bulletin 2023/46

(21)Application number: 23199938.4

(22)Date of filing:  03.07.2008
(51)International Patent Classification (IPC): 
H04W 74/00(2009.01)
H04W 76/10(2018.01)
H04W 74/08(2024.01)
(52)Cooperative Patent Classification (CPC):
H04W 74/004; H04W 74/0833
(84)Designated Contracting States:
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MT NL NO PL PT RO SE SI SK TR

(30)Priority: 08.08.2007 US 83578207

(62)Application number of the earlier application in accordance with Art. 76 EPC:
21184577.1 / 3944707
18208514.2 / 3496503
15190589.0 / 2991430
08779410.3 / 2186371

(71)Applicant: Telefonaktiebolaget LM Ericsson (publ)
164 83 Stockholm (SE)

(72)Inventors:
  • PARKVALL, Stefan
    167 57 Bromma (SE)
  • DAHLMAN, Erik
    112 23 Stockholm (SE)
  • TYNDERFELDT, Tobias
    Morristown, 07960 (US)

(74)Representative: Röthinger, Rainer 
Wuesthoff & Wuesthoff Patentanwälte PartG mbB Schweigerstrasse 2
81541 München
81541 München (DE)

  


(54)UPLINK SCRAMBLING DURING RANDOM ACCESS


(57) A method implemented in a user terminal (20) for performing a random access procedure is presented. The method comprises transmitting a first random access request message including a random access preamble to a radio base station (18) using a random access channel, RACH, radio resource and receiving a second random access response message from the radio base station (18). The second random access response message indicates a timing change, an identified radio resource of an uplink shared channel, UL-SCH, and a temporary user terminal identity. The method also comprises adjusting a timing at the user terminal (20) for transmitting signals to the radio base station (18) based on the timing change indicated in the second random access response message and, based on the adjusted timing, transmitting a third message to the radio base station (18) over the identified radio resource of the uplink shared channel. The third message includes a user terminal identity that was assigned to the user terminal before the random access procedure is scrambled using a cell-associated scrambling sequence that is not terminal-specific. Further still, the method comprises receiving a fourth contention resolution message from the radio base station (18) to complete the random access procedure.







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