25.331 3GPP PDF

ETSI TS V (). 1. 3GPP TS version Release Reference. RTS/TSGRvd Keywords. UMTS. Descriptor and Table of Contents (1 of 40) for 3GPP TS – Radio Resource Control (RRC) – Protocol specification. 3GPP TS V (). 2. Release Keywords. UMTS, radio. 3GPP. Postal address. 3GPP support office address. Route des Lucioles.

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MARBEN ASN.1 Solutions: 3GPP UMTS Messages Decoder

Message encoding is ASN. You 3hpp get a “clean” copy of that ASN. That information is very useful for understanding the actual meanings of some of the elements they contain. As per 3GPP All of the parameters are powers of 2, but the repeat periods can 25.31 set independently for each SIB type. The fact that SIBs can span multiple transport frames, or 25331 combined into shared transport frames, further complicates the set of scheduling possibilities. The best place to see this laid out in a clear way is in 3GPP There’s an overview of this in 3GPP The BCH transport block is always bits, including a header and data fields.

The channel bits are interleaved, split into 2 bit radio frames and interleaved again. The standard channel model includes rate-matching, but the sizes line up already, so rate-matching is a no-op.

Note these comments on the alignment of the scrambling code, from 3GPP The sequence of complex valued chips shall be scrambled complex chip-wise multiplication by 3ypp complex-valued scrambling code Sdl,n. In case of other downlink channels, the scrambling code shall be applied aligned with the scrambling code applied to the P-CCPCH. In this case, the scrambling code is thus not necessarily applied aligned with the frame boundary of the physical channel to be scrambled.

These chips are formed into QPSK symbols and prepared for transmission with the root-raised-cosine channel filter. This symbol 25.3331 is divided into 15 slots of symbols each.

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RACH transmissions from the user consists of two parts: The channel format and other details are outline in 3GPP The UE can start the random-access transmission at the beginning of a number of well-defined time intervals, denoted access 3gp.

There are 15 access slots per two frames and they are spaced chips apart over 2 UMTS frames. The timing of the access slots and the acquisition indication is described in subclause 7. Information on what access slots are available for random-access transmission is given by higher layers. Each preamble is of length chips and consists of repetitions of a signature of length 16 chips.

There are a maximum of 16 available signatures. The set of available signatures is indicated by the SIB5 message, and the UE uses the ASC to determine the subset of that set and access slot to use.

The UE selects the scrambling code number by adding the code number of the downlink primary scrambling code and the preamble scrambling code number from SIB5. The same scrambling code is used for the message part, but with a code offset.

Typically the RACH preamble detection and AICH response is done solely in the physical layer since there is no information or handling needed from the higher layers. Each slot consists of two parts, a data part to which the RACH transport channel is mapped and a control part that carries Layer 1 control information. The data and control parts are transmitted in parallel. A 10 ms message part consists of one message part radio frame, while a 20 ms message part consists of two consecutive 10 ms message part radio frames.

This TTI length is configured by higher layers. This corresponds to a spreading factor of, 64, and 32 respectively for the message data part.

Radio Resource Control

The control part consists of 8 known pilot bits to support channel estimation for coherent detection and 2 TFCI bits. 253.31 corresponds to a spreading factor of for the message control part. The pilot bit pattern is described in table 8. The TFCI of a radio frame indicates the transport format of the RACH transport channel mapped to the simultaneously transmitted message part radio frame.

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More details are in 3GPP Powered 3gppp Trac 0.

Type 3 — Cell identity and reselect information, similar to GSM cell selection parameters 3gppp 4 — Cell reselect parameters for connected mode, if different from those in SIB3. Type 12 — Measurement control information for connected mode, if different from SIB Type 13 — ANSI system information.

Type 14 — PHY information. Type 15 — GPS aiding information. Time and reference position appear to by mandatory. Type 18 — Neighbor identities. All elements are optional. Does that mean 3gppp whole message is optional? The simplest way to schedule the messages would be: N-1 with a repeat period of 8N, where N is a power of 2. Message Formation and ASN.

Radio Transmission These chips are formed into QPSK symbols and prepared for transmission with the root-raised-cosine channel filter. The RACH procedures is as follows: The terminal randomly selects one of the RACH sub-channels from the group its 3vpp class allows it to use.

Furthermore, the signature is also selected randomly from among the available signatures indicated in SIB5.

www.3gpp.org – /ftp/Specs/archive/25_series/25.331/

The downlink power level is measured and the initial RACH power level is set with the proper margin due to the open-loop inaccuracy. A 1 ms RACH preamble is sent with the selected signature. The terminal decodes AICH the preamble. The preamble is retransmitted in the next available access slot. The purpose of this procedure is to establish the appropriate uplink power level for the UE, since CDMA is exquisitely sensitive to variations in relative received power.

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