5 Physical layer procedures

04.043GPPLayer 1 - General RequirementsRelease 1999TS

The main body of physical layer procedures is specified in 3GPP TS 04.08, 3GPP TS 04.60 and 05.08.

5.1 States of the physical layer

In the physical layer of the MS the following states are defined:

NULL: the equipment is switched off;

SEARCHING BCH: the physical layer tracks the best BCCH;

BCH: the physical layer listens to a BCCH/CCCH or PBCCH/PCCCH and is able to do random access;

TUNING DCH: the physical layer seizes on a respective dedicated physical channel or packet data physical channel;

DCH: the physical layer has seized a respective dedicated physical channel or packet data physical channel and may establish and through connect logical channels.

NOTE: BCH = Bcch/ccch physical CHannel or pbcch/pccch physical channel; DCH = Dedicated physical CHannel or packet data physical channel.

Figure 5.1 gives a general state diagram of the physical layer. All state transitions of the physical layer are controlled by MPH‑INFORMATION primitives.

Figure 5.1: States of the physical layer in the MS

The states of the physical layer in the network are not specified. The states in the network will reflect the other characteristics of operation on channels.

5.2 Control procedures

Requirements and examples of procedures for idle mode and for packet mode operation of the MS are specified in 3GPP TS 02.11 and 3GPP TS 05.08. In the idle mode and packet mode procedures the physical layer tracks the best cell and may tune on their BCCH/PBCCH in order to enable layer 3 to read the system information of the BCCH/PBCCH. This system information of the BCCH/PBCCH is used in the selection process.

5.3 Physical layer interface procedures

Three types of primitives are defined for the communication between the physical layer and the data link layer both in the MS and the network. When a control channel or a packet data physical channel is being established, a PH‑CONNECT‑INDICATION is offered to the data link layer or the RLC/MAC layer, the one which is applicable, on the corresponding SAP. On an established full duplex control channel (DCCHs) in both MS and network, on an established packet data physical channel or on the established BCCH/CCCH in the MS, physical blocks received correctly are offered on the corresponding SAP in PH‑DATA‑INDICATION primitives. On a full duplex control channel (DCCHs) or on the BCCH/CCCH in the network, the data link layer will offer physical blocks to be transmitted in PH‑DATA‑REQUEST primitives. On a packet data physical channel, the RLC/MAC layer will offer physical blocks to be transmitted in PH‑DATA‑REQUEST primitives. In the MS in idle mode or in packet wait state, random accesses on RACH or on PRACH can be offered in PH‑RANDOM ACCESS‑REQUEST primitives. The physical layer of the MS will perform a random access as soon as possible. The physical layer of the MS will confirm the data link layer or the RLC/MAC layer, the one which is applicable, the transmission of the random access attempt in a PH‑RANDOM ACCESS‑CONFIRM. This confirmation contains the absolute frame number in which the random access is transmitted. The physical layer of the BS offers correctly received random accesses to the data link layer or the RLC/MAC layer, the one which is applicable, in a PH‑RANDOM ACCESS‑INDICATION. This indication contains the absolute frame number in which the random access is received.