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Method and apparatus for supporting RACH-less mobility with pre-allocated beams in wireless communication system

專利號(hào)
US11503634B2
公開日期
2022-11-15
申請(qǐng)人
LG ELECTRONICS INC.（KR Seoul）
發(fā)明人
Youngdae Lee; Yejee Lee; Sunyoung Lee
IPC分類
H04W74/02; H04W36/00; H04W36/02; H04W72/04; H04W72/14; H04W74/04; H04W74/08; H04W76/27; H04L5/00; H04W8/26
技術(shù)領(lǐng)域
ue,ho,rach,allocated,ul,gnb,target,message,pre,srs
地域： Seoul

摘要

A method and apparatus for supporting a random access channel (RACH)-less mobility with pre-allocated beams in a wireless communication system is provided. A user equipment (UE) receives a mobility command message which includes information on a pre-allocated UL resource for UL transmission with pre-allocated beams, synchronizes to a target cell, and performs the UL transmission to the target cell via the pre-allocated beams based on the pre-allocated UL resource for UL transmission to transmit a mobility complete message via a UL grant. If the UL transmission fails, the UE may perform RACH procedure.

說明書

    • consider sequentially that the Nth grant occurs in the subframe for which:
      subframe=[N*ul-SchedInterval+ul-StartSubframe] modulo 10.

    • For time division dulplex (TDD), the MAC entity is configured with ul-SchedInterval shorter than 10 subframes, the Nth grant shall be ignored if it occurs in a DL subframe or a special subframe.

    Retransmission for UL transmissions using the pre-allocated UL grant can continue after clearing the pre-allocated UL grant.

    If the target eNB does not support the release of RRC protocol which the source eNB used to configure the UE, the target eNB may be unable to comprehend the UE configuration provided by the source eNB. In this case, the target eNB should use the full configuration option to reconfigure the UE for HO and re-establishment. Full configuration option includes an initialization of the radio configuration, which makes the procedure independent of the configuration used in the source cell(s) with the exception that the security algorithms are continued for the RRC re-establishment.

    The same behavior applies in EN-DC, if upon HO the target eNB is unable to comprehend the MCG part of the UE configuration i.e. the target eNB uses the full configuration option which involves release and configuration of (most of the) MCG and NR SCG configuration. In case of EN-DC, the target SgNB may be unable to comprehend the NR SCG configuration provided by the source SgNB. In such a case, the full configuration option may be applied for the NR SCG part of the configuration only.

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