CQI Reporting Principle

From HSDPA System Architecture & Protocols 2002

Power CAC Algorithm

~Algorithm 1 (ALGORITHM_FIRST): based on UL/DL load measurement and load prediction (RTWP and TCP)
-admission decision based on predicted load increment upon admission of a new service-Based on the current cell load (indicated by the uplink load factor and downlink TCP) and the predicted load increment due to admission of the new service, the RNC determines whether the cell load will exceed the threshold upon admitting the new service. If yes, the RNC rejects the access request. If not, the RNC accepts the access request.

~Algorithm 2 (ALGORITHM_SECOND): based on Equivalent Number of User (ENU)
admission decision based on the ENU
-Depending on the current ENU and the access request, the RNC determines whether the ENU will exceed the threshold upon admitting a new service. If yes, the RNC rejects the request. If not, the RNC accepts the request.

~Algorithm 3 (ALGORITHM_THIRD): loose call admission control algorithm
-admission decision based on no load increment upon admission of a new service
-This algorithm assumes that load increment upon admission of a new service is 0. Based on the current cell load (indicated by the uplink load factor and downlink TCP), the RNC determines whether the cell load will exceed the threshold upon admitting the new service. If yes, the RNC rejects the access request. If not, the RNC accepts the access request. 

Handset Antenna Type

 - ‘Handset Antenna Design’ By Dr Sampson Hu, Smart Antenna Technologies

SDUs and PDUs

is Protocol ( not Packet) Data Unit and Service (not Signaling) Data Unit.

Initial Acquisition Procedure

-Qualcomm University

LTE RRC Connection Reject Message

According to the 3GPP TS 36.331 , RRC CONNECTION REJECT message is used to reject the RRC connection establishment. This message includes the IE waitTime which can be in the range from 0 to 16 seconds. Optionally, the NW can include the IE extendedWaitTime for the purpose of Delay Tolerant access requests

          Upon receiving the RRC CONNECTION REJECT message, the UE should start timer T302, with the timer value set to waitTime. The UE is not allowed to send another RRCConnectionRequest for mobile originating calls, mobile originating signalling, mobile terminating access and mobile originating CS fallback on the same cell on which RRC CONNECTION REJECT is received until the expiry of T302

 The following differences are noted as compared to UMTS RRC CONNECTION REJECT:

1.             There is no RejectionCause in the case of LTE

2.             RedirectionInfo which is used to redirect the UE to another frequency/RAT is not present in the case of LTE

3.             LTE requires the higher layers to initiate new RRC CONNECTION REJECT after receiving RRC CONNECTION REJECT, where as in the case of UMTS, the procedure is repeated for N300 times

BLER and SIR

Block Error Rate (BLER) is an analysis of transmission errors on the radio interface.

It is based on analysis of cyclic redundancy check (CRC) results for radio link control (RLC) transport blocks and computed as below:

Signal-to-Interference Ratio (SIR), also known as the carrier-to-interference ratio (C/I, CIR), is the quotient between the average received modulated carrier power and the average received co-channel interference power.

For UL Power Control:

Example: Mobility movement > Handover trigger > SIR Error > UL BLER