FAJ 121 1474: LTE Cell Reselection

This feature supports inter-operability with LTE for UE in Idle Mode and UE in URA_PCH mode. This feature provides required functions on the WCDMA side, while the corresponding feature on the LTE/EPS side provides mobility from LTE to WCDMA. A multi-standard UE can move freely between WCDMA and LTE using the UE-controlled absolute priority cell reselection mechanism and information broadcast in system information.

This feature assures continuous packet services for LTE subscribers also when no LTE coverage is available.

For more information, refer to Idle Mode and Common Channel Behavior.

2.2.20 FAJ 121 1476: Enhanced Downlink Reception, CPC

This feature helps to improve terminal power consumption and serves as a mandatory complement to the feature FAJ 121 1389: Enhanced Uplink Transmission, CPC. The feature covers the DL Discontinuous Reception (DRX) functionality introduced with CPC in 3GPP release 7.

This feature introduces DL DRX so the UE can listen discontinuously to the High-Speed Shared Control Channel (HS-SCCH), while inactive on CELL_DCH. This feature requires the following RAN features:

• FAJ 121 1023: Enhanced Uplink Introduction Package • FAJ 121 1320: SRB on HSDPA

• FAJ 121 1389: Enhanced Uplink Transmission, CPC For more information, refer to CPC.

2.2.21 FAJ 121 1483: 64QAM and MIMO Combination

This feature allows the use of 64QAM modulation together with Multiple Input Multiple Output (MIMO) on the HS-PDSCH. This increases user throughput on the DL.

The combination of 64 QAM and MIMO is standardized in 3GPP Rel8. The enhanced Layer 2 protocol Medium Access Control enhanced high speed (MAC-ehs) is needed to enable 64 QAM and MIMO. For power balancing between the two power amplifiers, MIMO requires Transmitter (TX) diversity or Pre-coder for Power Balancing.

This feature requires the following RAN features: • FAJ 121 1331: Support for 64 QAM

• FAJ 121 1510: Pre-coder for Power Balancing, or FAJ 121 1128: Transmit Diversity

For more information, refer to Connection Handling and HSDPA User Plane. For information about activation and deactivation, refer to HSDPA Migration and Activation.

2.2.22 FAJ 121 1496: Faster Establishment, Direct Upswitch from URA

This feature improves latency rates during session setup in WRAN. Instead of a connection switching up to CELL_FACH and then CELL_DCH, an upswitch directly from URA_PCH to CELL_DCH is made.

During upswitch, the repetitions of the Cell Update Confirm message on FACH can be configured for PS-initiated calls. The configured repetition time is a trade-off between FACH1 load and the success rate of the direct upswitch to CELL_DCH and both must be considered when tuning this parameter. This feature requires the optional RAN feature FAJ 121 407, UTRAN Registration Area Handling.

For information about activation and deactivation, refer to Channel Switching.

2.2.23 FAJ 121 1510: Pre-coder for Power Balancing

To use the radio node power efficiently when MIMO is activated in the cell, the output power needs to be balanced between the two power amplifiers. A pre-coder is implemented in the baseband to balance power when MIMO is activated or the cell is configured with two TX branches.

For the configurations of two branches with different power capabilities, when the NodeBFunction::nonEqPwrCommonPrecoderState parameter is set to ACTIVATED, the total cell power is the sum of the output power of the two branches instead of based on the least capable branch.

For more information, refer to HSDPA Migration and Activation.

2.2.24 FAJ 121 1552: Fast Dormancy Handling

This feature is used to control whether the UE is switched to URA instead of Idle during fast dormancy signaling. Subsequent data can then be handled by an upswitch to FACH when the amount of data is lower, and to HSPA when the amount is higher. As an overall result, the signaling load is improved for chatty applications with fast dormancy that otherwise are typically switched between HSPA and Idle Mode.

This feature requires the optional RAN feature FAJ 121 407: UTRAN Registration Area Handling.

For more information, refer to Connection Handling and Channel Switching.

2.2.25 FAJ 121 1581: RNC RRC Load Control

The RNC RRC Load Control function prevents a single Module MP (mMP) processor overload. The feature detects the RRC admission load peak buildup in an mMP and limits the peak growth to bring the MP load back to a sustainable level.

For more information, refer to RNC RRC Load Control, Capacity Management and Network Robustness and Network Load Regulation.

2.2.26 FAJ 121 1584: UL Efficiency - DCH/EUL Load Balancing

This feature introduces load balancing between DCH and EUL users. EUL congestion is detected when the average rate for the EUL-connected UE units with the unhappy bit set is below a certain threshold for a specified time. The Node B Application Part (NBAP) measurement report is then sent to the RNC. The RNC initiates congestion resolving action, that is a stepwise channel switching of DCH users to lower rate, but not lower than the lowest DCH UL rate. During EUL congestion, the DCH-DCH upswitch on UL is not allowed. RAB establishment on EUL and high DCH rate attempts are rejected, but after a retry, a setup on the lowest DCH is possible. As a result, the service quality of EUL users improves.

This feature requires the following RAN features:

• FAJ 121 1023: Enhanced Uplink Introduction Package

• Having the feature FAJ 121 905: HSDPA Interactive 384/HS RAB PS (16/HS) + SRB (3.4/3.4) installed and activated is recommended, because the UL resource used by DCH needs to be low to make enough room for EUL users

For more information, refer to UL Efficiency – DCH/EUL Load Balancing, Capacity Management and Enhanced UL Scheduler.

2.2.27 FAJ 121 1593: Admission Block Redirection

This feature enables redirection to other WCDMA cells or to GSM, when the original access is blocked by admission control because of the high load. When an RRC connection request is blocked by admission control, the UE can be ordered to rescan on another WCDMA frequency and try again, and an RRC request for an originating speech call can be redirected to GSM. If a speech call is blocked by admission control at RAB establishment, a directed retry to a predefined GSM cell can be ordered instead.