lte network registration process (2)
This article talk about it lte system information is divided into existence sib1-sib12 Mib and sib, sib information systems, introduces the next mib action, sib1 sib2 sib3 sib4 sib4 of.
MIB:
MIB contains important system information including a cell identification (PCI), the frequency, the current system frame number, the number of transmit antennas and cell bandwidth, a PHICH channel configuration.
sib1 information
sib1 also important system information, the terminal is attached to the essential lte network, comprising the plmn value, the cell selection criteria, cell indicates the operating frequency band, the scheduling information of other sib message.
sib2 information
sib2 also carry important system information, such as whether the cell is blocked, whether to allow the UE is camped cell, all the physical channel configuration, the configuration of some important timer.
A variety of channel configurations I did not understand the whole, said the main role of the following timers.
T300: RRC connection establishment timer
T301 timer: RRC reconstruction timer
T310: the down step-timer
N310: Maximum number of accepted sync indication, associated with the t310
, etc.
If you need, please check it yourself at various timers role lte .
SIB3 message
comprising cell selection and reselection information.
SIB4, SIB5
SIB4 lte network comprising the intra-frequency neighboring cell information, inter-frequency SIB5 comprising lte network or within different bands neighboring cell information mainly includes the value of the specific frequency cell, the cell reselection threshold, the cell weight election priority.
About the cell reselection criteria are as follows:
high priority cell 1. reselection to
the high priority cell signal strength greater than a specified limit within a specified time gate
ue in the residence time is greater than the current serving cell lS
2. priority to the same cell reselection
equivalent signal strength priority cell must be specified for greater than the current serving cell signal strength within time
ue the residence time is greater than the current serving cell lS
3. the lower priority cell reselection
has no priority equal to or higher than the priority of the current serving cell cell signal strength is greater than a specified threshold
current serving cell signal strength is less than the specified threshold
low priority candidate cell signal strength is greater than the specified duration of time gates within specified limits
ue residence time in the current serving cell is greater than 1s
Guidelines on the measurement cell
1. If the serving cell is the highest priority cell, is higher than the specified duration of the gate signal strength measurement does not limit
2. If the signal strength of the serving cell is less than a specified threshold, the system needs to measure the signal strength of the frequency with different cell
3 If the service cell is not the highest priority cell, is necessary to periodically measure the high priority than the serving cell of the cell signal strength
is lower than the priority of the serving cell, only the serving cell signal strength less than a prescribed threshold only to measure.
