channel element (ce) resource.pdf

9/26/2014 technology-lifestyle: Channel Element (CE) Resource

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Channel Element (CE) Resource

CE resources are a type of NodeB hardware resource. The number of CEs supported by single NodeB indicates thechannel demodulation capabilities resource of the NodeB. The more CEs a NodeB supports, the more powerful thechannel demodulation and service processing capabilities for serving the customers. Services at different rates requiredifferent numbers of CEs to ensure proper channel demodulation.In a RAN, CE resources are managed by both the RNC and NodeB. The NodeB reports its CE capacity to the RNC. TheRNC determines whether to admit a new service based on the number of CEs that need to be consumed and controlsCE resources during CE congestion. This ensures the proper use of CE resources. The NodeB dynamically manages CEresources and rapidly adjusts the number of CEs that can be consumed based on the actual service rate. Thisincreases CE resource usage.

A proper use of CE resources increases the number of UEs that can be admitted and improves the service quality ofthe admitted UEs.

Basic Channel Element ConceptsCE is a basic unit that measures the channel demodulation capabilities of a NodeB. CEs are classified into uplink (UL)CEs and downlink (DL) CEs.

One UL CE needs to be consumed by a UL 12.2 kbit/s voice service (SF = 64) plus 3.4 kbit/s signaling.One DL CE needs to be consumed by a DL 12.2 kbit/s voice service (SF = 128) plus 3.4 kbit/s signaling.

If only 3.4 kbit/s signaling traffic is carried on a DCH or HSPA channel, one CE still needs to be consumed. The numberof CEs that need to be consumed by services of other types can be calculated by analogy.The number of UL and DL CEs supported by a NodeB is determined by the NodeB hardware capabilities and thelicensed CE capacity. The number of UL and DL CEs supported by the NodeB hardware is called the physical CEcapacity. The licensed CE capacity may differ from the physical CE capacity. The smaller determines the number ofCEs that can be used by an operator.CE is a concept of the NodeB side. On the RNC side, it is called NodeB credit. The RNC performs admission andcongestion control based on the NodeB credit. In the UL, the number of Node credit resources is twice that of CEs. Inthe DL, the number of NodeB credit resources equals that of CEs.

CE Sharing in a Resource GroupTo facilitate baseband resource management, NodeB baseband resources fall into UL and DL resource groups. The ULand DL resource groups are independent with each other.

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Channel Element (CE)ResourceCE resources are a type ofNodeB hard ware resource. The number ofCEs supported by single

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UL Resource Group

UL resource group is a UL resource pool shared on a per-channel basis, more than one cell can be setup in one ULresource group, One UL resource group can have multiple baseband boards, but one board can belong to only one ULresource group. CE resources in one UL resource group can be shared by baseband boards. This means that UEs in acell in a UL resource group can set up services on any board in the group. The physical CE capacity of a UL resourcegroup is the total CE capacity of baseband boards in the group.

DL Resource Group

Different from a UL resource group, a DL resource group is shared on a per-cell basis. Resources in a DL resourcegroup are allocated to each baseband board based on cells; one board can be configured to multiple DL resourcegroups. DL CE resources for UEs in the same cell can be provided by any baseband board in the DL resource group. CEresources in one DL resource group can be shared only within a baseband board.

NodeB CE Capacity SpecificationsTypically different baseband boards of a NodeB have their own CE capacity specifications. For exampled, the detailedCE capacity specifications supported by each type of baseband board, see the BBU3900 Hardware Description productby HuaweiCE capacity here refers to the number of CEs that can be consumed by UL and DL R99 services and HSUPA services. Itdoes not include CE resources reserved by the NodeB for common and HSDPA channels.

Rules for Calculating CE ConsumptionThe RNC determines the number of CEs required for a service based on the SF that matches the service rate. When anRAB connection is set up or released for a service, CE resources must be allocated or taken back and the number ofCEs must be deducted or added accordingly. Different rules for calculating CE resource consumption apply to channelsor services of different types.

CE resources reserved by the NodeB for common and HSDPA channels are shown in gray. CE resources that need to be consumed by R99 and HSUPA services are shown in pink.

Common Channels CE ConsumptionCE resources required on the UL and DL common channels are reserved by the NodeB. Therefore, they do not occupythe licensed CE capacity. These CEs do not need to be considered in the calculation of CE consumption.

HSDPA Channels CE ConsumptionSimilarly, the NodeB reserves CE resources for the high-speed downlink shared channel (HS-DSCH) and the relatedcontrol channels if HSDPA is used. These CEs also do not need to be considered in the calculation of CE consumption.Note that the signaling of an HSDPA UE that is not performing an R99 service occupies one DCH and needs to consumeone DL CE. If the SRB over HSDPA function is enabled, the signaling of an HSDPA service does not consume additionalCE resources. For an HSDPA UE that is performing an R99 service, its signaling and the R99 service occupy the sameDCH. Therefore, only the CEs consumed on R99 traffic channels need to be calculated.

R99 Service CE ConsumptionFor an R99 service, the RNC determines the number of CEs and NodeB credit resources that need to be consumedbased on the SF that matches the maximum bit rate (MBR) of the service.

Direction Rate(kbit/s)

SF Number of CEsConsumed

CorrespondingCredits Consumed

UL 3.4 256 1 2

13.6 64 1 2

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8 64 1 2

16 64 1 2

32 32 1.5 3

64 16 3 6

128 8 5 10

144 8 5 10

256 4 10 20

384 4 10 20

DL 3.4 256 1 1

13.6 128 1 1

8 128 1 1

16 128 1 1

32 64 1 1

64 32 2 2

128 16 4 4

144 16 4 4

256 8 8 8

384 8 8 8

HSUPA Service CE ConsumptionFor an HSUPA service, the RNC determines the number of CEs and NodeB credit resources that need to be consumedbased on the SF that matches the service rate. The RNC determines the SF based on a certain rate in the followingways:

If the UL enhanced L2 function is disabled and the NodeB indicates in a private information element (IE)that dynamic CE resource management has been enabled in the cell, the RNC calculates the SF based onthe larger of the bit rate of one RLC PDU and the guaranteed bit rate (GBR).

If the UL enhanced L2 function is disabled, the RLC PDU size is fixed. The bit rate of one RLCPDU is determined by the RLC PDU size and transmission time interval (TTI).

If the UL enhanced L2 function is enabled and the NodeB indicates in a private IE that dynamic CE resourcemanagement has been enabled in the cell, the RNC calculates the SF based on the larger of the bit rate ofthe smallest RLC PDU and the GBR.

If the UL enhanced L2 function is enabled, the RLC PDU size is flexible. The bit rate of thesmallest RLC PDU is determined by the minimum RLC PDU size and the TTI. The minimum RLCPDU size can be specified by the RlcPduMaxSizeForUlL2Enhance parameter.

If the NodeB reports that dynamic CE resource management has been disabled, the RNC calculates the SFbased on the MBR.If the NodeB does not report whether dynamic CE resource management has been enabled, the RNCcalculates the SF based on the value of the HsupaCeConsumeSelection parameter and whether the ULenhanced L2 function is enabled.

If HsupaCeConsumeSelection is set to MBR, the RNC calculates the SF based on the MBR.If HsupaCeConsumeSelection is set to GBR:

If the UL enhanced L2 function is disabled, the RNC calculates the SF based on thelarger of the bit rate of one RLC PDU and the GBR.If the UL enhanced L2 function is enabled, the RNC calculates the SF based on thelarger of the bit rate of the smallest RLC PDU and the GBR.

After determining the SF, the RNC searches the CE consumption mapping listed below

Direction Rate(kbit/s)

SF Number of CEsConsumed

CorrespondingCredits Consumed

UL 8 64 1 2

16 64 1 2

32 32 1 2

64 32 1 2

128 16 2 4

144 16 2 4

256 8 4 8

384 4 8 16

608 4 8 16

1450 2SF4 16 32

2048 2SF2 32 64

2890 2SF2 32 64

5760 2SF2+2SF4 48 96

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CE Consumption of 4-Way Receive DiversityThe use of 4-way receive diversity does not affect DL CE consumption but doubles UL CE consumption. The use of 4-way receive diversity can be configured by resource group. UL CE consumption of a resource group doubles if theresource group is configured with 4-way receive diversity. CE consumption of a common resource group remainsunchanged.examples of CE Consumption

UE A, which performs a UL 64 kbit/s and DL 384 kbit/s service on the DCH, consumes three UL CEs andeight DL CEs.UE B, which performs a UL 64 kbit/s and DL 1024 kbit/s service on the DCH and HS-DSCH respectively,consumes three UL CEs and one DL CE if the DL signaling radio bearer (SRB) is carried on the DCH.UE C, which performs a UL 608 kbit/s and DL 1024 kbit/s service on the E-DCH and HS-DSCH respectivelyand at the same time performs an AMR speech service, consumes nine UL CEs and one DL CE.

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