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3GPP TS 25.331 version 12.3.0 Release 12<br />

1863<br />

ETSI TS 125 331 V12.3.0 (2014-10)<br />

Since no length denominator is included, the receiving RRC cannot remove the padding added by the sender. However,<br />

since the padding used is the same as the padding added by the PER encoder to achieve octet alignment, the receiver<br />

can handle it.<br />

NOTE 1 The mechanism described above implies that the PDU provided to the ASN.1 decoder may have more<br />

than 7 padding bi<strong>ts</strong> included. For a complete System Information Block of length 215 bi<strong>ts</strong>, 11 padding<br />

bi<strong>ts</strong> are added by RRC. Since the decoder requires an octet aligned input, 6 additional bi<strong>ts</strong> need to be<br />

added. In this (worst) case, a total of 17 padding bi<strong>ts</strong> is included.<br />

NOTE 2 For the above cases, use of padding bi<strong>ts</strong> is possible and more efficient than including a length<br />

denominator.<br />

When using the RRC padding described above, the segment has a fixed length, which completely fills the transport<br />

block. Therefore, in this case no RRC padding is added within the SYSTEM INFORMATION message or SYSTEM<br />

INFORMATION 2 message. This is illustrated by means of the following figure.<br />

SIBn- ASN.1<br />

SIBn, r99 part<br />

Extension<br />

ASN.1 encoding<br />

SIBn, r99 part<br />

Extension<br />

Encoder added<br />

padding (0..7 bi<strong>ts</strong>)<br />

Segmentation &<br />

concatenation,<br />

PCI<br />

SIBn<br />

PCI<br />

SIBn<br />

First segment<br />

Last segment<br />

ASN.1 encoding<br />

PCI SIBn<br />

RRC-PDU<br />

Last segment<br />

Figure 12.1.3-3: No RRC padding for System Information<br />

12.2 ECN link module for RRC<br />

RRC-ECN-Link-Module LINK-DEFINITIONS ::=<br />

BEGIN<br />

IMPORTS<br />

RRC-encodings<br />

FROM RRC-Encoding-Definitions;<br />

-- Encoding objec<strong>ts</strong> for RRC messages<br />

ENCODE Class-definitions<br />

WITH RRC-encodings<br />

COMPLETED BY PER-BASIC-UNALIGNED<br />

ENCODE PDU-definitions<br />

WITH RRC-encodings<br />

COMPLETED BY PER-BASIC-UNALIGNED<br />

ENCODE InformationElemen<strong>ts</strong><br />

WITH RRC-encodings<br />

COMPLETED BY PER-BASIC-UNALIGNED<br />

ETSI

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