Power-Based Admission Algorithm 1

Power-based admission decision based on algorithm 1 consists of uplink power–based admission decision and downlink power-based admission decision procedures.

Uplink Power–Based Admission Decision for R99 Cells Based on Algorithm 1

Figure 7-22 shows the procedure of uplink power–based admission decision for R99 cells.

Figure 7-22 Uplink power–based admission decision for R99 cells

The procedure of uplink power–based admission decision for R99 cells is as follows:

1. The RNC obtains the uplink RTWP of the cell and uses the formula

to calculate the current uplink load factor ηUL, where PN is the received uplink background noise.

2. The RNC calculates the uplink load increment ΔηUL based on the service request.

3. The RNC uses the following formula to predict the uplink load factor:

ηUL,predicted = ηUL + ΔηUL + ηULcch

In the formula, ηULcch is specified by UlCCHLoadFactor.

The uplink load increment ΔηUL is determined by the following factors:

 Eb/N0 of the new incoming call, which has a positive correlation with the uplink load increment

 UL neighbor interference factor, which has a positive correlation with the uplink load increment

 Active Factor (AF) of the new incoming call, which has a positive correlation with the uplink load increment, and varies with the traffic class, user priority level, and carrier type (DCH or HSPA) 4. By comparing the predicted uplink load factor ηUL,predicted with the corresponding

threshold (UlNonCtrlThdForHo, UlNonCtrlThdForAMR,

UlNonCtrlThdForNonAMR, or UlNonCtrlThdForOther), the RNC decides whether to accept the access request. If the access request is accepted, the RNC processes the access request. If the access request is rejected, the RNC performs the next step.

5. The RNC checks whether the Control RTWP Anti-interfence algorithm switch (RsvdBit1) is enabled. If it is enabled, the RNC checks whether the uplink equivalent user load proportion of the cell is lower than 40%. If it is lower than 40%, the RNC accepts the access request. Otherwise, the RNC rejects the access request.

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Uplink Power–Based Admission Decision for HSPA Cells Based on Algorithm 1

The power increment of an HSUPA service is related to the following factors:

 Ec/N0 of the GBR of the service

 Neighboring interference factor

 AF of the service

The formula is similar to that for R99. After the RSEPS measurement is introduced, the UL RTWP is divided into two parts: controllable part and uncontrollable part. The controllable part is generated by the E-DCH scheduling service, and others belong to the uncontrollable part. Figure 7-23 shows the uncontrollable part of the UL RTWP.

Figure 7-23 Uncontrollable part of the UL RTWP

The E-DCH scheduling service involves the following types of UEs:

 Type A: UEs of this type are in the serving E-DCH cell.

 Type B: UEs of this type are not in the serving E-DCH cell.

The methods of calculating the uplink load vary according to user type.

 For type A, the uplink load generated by the E-DCH scheduling service is calculated as follows:

, ,

UL EDCH S

RSEPS

  RTWP

 For type B, the uplink load generated by the E-DCH scheduling service is calculated through , which is set to 0.

The uplink uncontrollable load is calculated as follows:

The measure taken by CAC is determined by the actual bearer type and whether the scheduling mode is used.

Admission of HSUPA Scheduling Services and HSUPA Non-Scheduling Services

Since the HSUPA scheduling algorithm consumes additional uplink power resources, the power load of the HSUPA cell is always relatively high. Therefore, the CAC algorithm combines the PBR-based decision with the load-based decision to reduce the number of potential erroneous rejections.

PBR-based decision is used to check whether the QoS requirement of existing users is fulfilled. The QoS is measured on the basis of the Provided Bit Rate (PBR) of the users.

If the QoS requirement is fulfilled, new users are allowed to access the network.

As shown in the previous figure, the Scheduling Priority Indicator (SPI) of a new HSUPA user is SPINew user.

When the admission of HSUPA scheduling services is implemented, the following formulas apply:

1.

2.

3.

4.

5.

Here:

− ThdL is the low priority HSUPA user PBR threshold (HsupaLowPriorityUserPBRThd).

− ThdE is the equal priority HSUPA user PBR threshold (HsupaEqualPriorityUserPBRThd).

− ThdGE is the high priority HSUPA user PBR threshold (HsupaHighPriorityUserPBRThd).

− ηHS-DPCCH is the UlHsDpcchRsvdFactor parameter.

− ηthd is the cell UL admission threshold of a specific type of service. The threshold may be UlNonCtrlThdForAMR, UlNonCtrlThdForNonAMR,

UlNonCtrlThdForOther, or UlNonCtrlThdForHo.

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9 The RNC admits the HSUPA scheduling services in either of the following cases:

− Formula 1, 2, or 3 is fulfilled.

− Formula 4 is fulfilled.

For HSUPA non-scheduling services, the RNC admits the HSUPA non-scheduling services in either of the following cases:

− Formula 1, 2, or 3 is fulfilled.

− Formulas 4 and 5 are fulfilled.

If the HSUPA scheduling services or non-scheduling services are rejected according to the previous conditions, the RNC checks whether the Control RTWP Anti-interfence algorithm switch (RsvdBit1) is enabled. If it is enabled, the RNC checks whether the uplink equivalent user load proportion of the cell is lower than 40%. If it is lower than 40%, the RNC accepts the access request. Otherwise, the RNC rejects the access request.

 The IMS signaling service over HSUPA can be directly admitted.

 For the first HSUPA service accessing the cell, the decision formulas that involve PBR are regarded as unsatisfied.

 If the PBR measurement is deactivated, the decision formulas that involve PBR are regarded as unsatisfied.

 If the RSEPS measurement is deactivated, the admission algorithm automatically changes into algorithm 2.

 For details about the scheduling mode of services on HSUPA, see the Radio Bearer Parameter Description.

Admission of DCH Services

Uncontrollable interference must be kept within a certain range. The purpose is to ensure the stability of the system and to prevent non-scheduling services and DCH services from seizing the resources of HSUPA services. In this regard, the CAC algorithm combines the uncontrollable part–based decision and the total load–based decision.

When the admission of DCH services is implemented, the following formulas apply:

Here:

− is the UL total power threshold of the current cell (UlCellTotalThd).

−



is the cell UL admission threshold for a specific type of service. The threshold

thd

may be UlNonCtrlThdForAMR, UlNonCtrlThdForNonAMR, UlNonCtrlThdForOther, or UlNonCtrlThdForHo.

If formulas 1 and 2 are fulfilled, the RNC admits DCH services. If they are not fulfilled, the RNC checks whether the Control RTWP Anti-interfence algorithm switch (RsvdBit1) is enabled. If it is enabled, the RNC checks whether the uplink equivalent user load proportion of the cell is lower than 40%. If it is lower than 40%, the RNC accepts the access request. Otherwise, the RNC rejects the access request.

Downlink Power–Based Admission Decision for R99 Cells Based on Algorithm 1

Figure 7-24 shows the procedure of downlink power–based admission decision.

Figure 7-24 Downlink power–based admission decision procedure

The procedure of downlink power–based admission decision is as follows:

1. The RNC obtains the cell downlink TCP and calculates the downlink load factor ηDL by dividing the maximum downlink transmit power Pmax by this TCP.

2. The RNC calculates the downlink load increment ΔηDL based on the service request and the current load.

3. The RNC uses the following formula to predict the downlink load factor:

ηDL,predicted = ηDL + ΔηDL + ηDLcch

In the formula, ηDLcch is the percentage of reserved DL common channel load (DlCCHLoadRsrvCoeff).

4. By comparing the downlink load factor ηDL,predicted with the corresponding threshold (DlConvAMRThd, DlConvNonAMRThd, DlOtherThd, and DlHOThd), the RNC decides whether to accept the access request.

The downlink load increment ΔηDL is determined by the following factors:

 Eb/N0 of the incoming new call, which has a positive correlation with the downlink load increment

 Non-orthogonal factor, which has a positive correlation with the downlink load increment

 Current TCP, which has a negative correlation with the downlink load increment

 Active Factor (AF) of the incoming new call, which has a positive correlation with the downlink load increment

Downlink Power–Based Admission Decision for HSPA Cells Based on Algorithm 1

 Power Increment Estimation for DCH RAB

The power increment estimation for the DCH RAB in the HSPA cell is similar to the DCH RAB in the R99 cell.

 Power Increment Estimation for HSDPA RAB

Issue Error! Unknown Error! Unknown document property 11 The power increment estimation for HSDPA RAB ΔPDL is made on the basis of GBR, Ec/N0, non-orthogonal factor, and so on.

 Downlink Radio Admission Decision for DCH RAB

When the admission of the DCH RAB is implemented, the following formulas apply:

1.

2.

3.

Here:

− is the current non-HSPA power.

− is the power reserved for the common channel.

− is the maximum transmit power of the cell.

− is the cell DL admission threshold for a specific type of service.

The threshold may be DlConvAMRThd, DlConvNonAMRThd, DlOtherThd, and DlHOThd.

− is the current downlink TCP.

− is the threshold of the total DL power of the cell (DlCellTotalThd).

− is the minimum power required to ensure the GBR.

− is the power reserved for HSUPA downlink control channels (E-AGCH/E-RGCH/E-HICH).

− is the maximum available power for HSPA. Its value is associated with the HSDPA power allocation mode. For details, see the HSDPA Parameter Description.

The RNC admits the DCH RAB in either of the following situations:

− Formulas 1 and 2 are fulfilled.

− Formulas 1 and 3 are fulfilled.

If the GBP measurement is deactivated, the GBP involved in the decision formulas is set to 0.

 Downlink Radio Admission Decision for HSDPA RAB

When the admission of the HSDPA RAB is implemented, the following formulas apply:

1.

2.

3.

4.

5.

Here:

− is the provided bit rate of all existing streaming services.

− is the admission threshold for streaming PBR decision (HsdpaStrmPBRThd).

− is the provided bit rate of all existing BE services.

− is the admission threshold for BE PBR decision (HsdpaBePBRThd).

− is the minimum power required to ensure the GBR.

− is the power reserved for HSUPA downlink control channels (E-AGCH/E-RGCH/E-HICH).

− is the maximum available power for HSPA. Its value is associated with the HSDPA power allocation mode. For details, see the HSDPA Parameter Description.

− is the current downlink TCP.

− is the maximum transmit power of the cell.

− is the threshold of total DL power of the cell, which is specified by the DlCellTotalThd parameter.

− is the power reserved for the common channel.

− is the current non-HSPA power.

The RNC admits the HSDPA streaming RAB in any of the following situations:

− Formula 1 is fulfilled.

− Formulas 3 and 4 are fulfilled.

− Formulas 3 and 5 are fulfilled.

The RNC admits the HSDPA BE RAB in any of the following situations:

− Formula 2 is fulfilled.

− Formulas 3 and 4 are fulfilled.

− Formulas 3 and 5 are fulfilled.

 If PS conversational services are carried on HSPA, the services can be treated as streaming services during admission control.

 If the GBP measurement is deactivated, the GBP involved in the decision formulas is set to 0.

 If the PBR measurement is deactivated, the decision formulas that involve PBR are regarded as dissatisfied.

 For the first HSDPA service accessing the cell, the decision formulas that involve PBR are regarded as unsatisfied.

 Downlink Radio Admission Decision for HSUPA Control Channels

The power of downlink control channels (E-AGCH/E-RGCH/E-HICH) is determined by DlHSUPARsvdFactor. Therefore, the power-based admission for these channels is not needed.

 Downlink Power–Based Admission Decision for MBMS For details, see the MBMS Parameter Description.

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