|
Hello, Maybe this is not a good
question to ASN.1 post. I had a trouble to read some
CSN.1 source from 3GPP spec. CSN.1 is new to me. Here is one sample code which
is described by CSN.1 for Packet Channel Description of 3 octets length. I know
each IE definition. But I don’t know where it start from and where to end from
in bit level. I searched CSN from internet and didn’t get what I want. So I
post it here for help. For following sample, one set
of hex code is given as {0x48, 0x74, 0x7E }. How can I interpret it in bit
level? For example, where does the fist item <channel type : bit(5)>,
which is one 5 bits long item, start from (LSB/MSB of which octet)? Any of your help will be appreciated! --Packet channel description
CSN.1 <
Packet Channel Description > ::= <
Channel type : bit (5) > <
TN : bit (3) > <
TSC : bit (3) > {
0 {
0 < spare bit > <
ARFCN : bit (10) > -- non-hopping RF
channel configuraion |
1 < spare bit > <
MAIO : bit (6) > -- indirect encoding of
hopping RF channel configuration <
MA_NUMBER_IND : bit > { 0
< spare bits : bit (2) > | 1
< CHANGE_MARK_1 : bit (2) > } } |
1 <
MAIO : bit (6) > -- direct encoding of
hopping RF channel configuration <
HSN : bit (6) > }; --End
of Packet channel description Best regards |
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