lte eran6.0 carrier aggregation feature issue1.00

LTE eRAN6.0 Carrier Aggregation Feature

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Classification of CA

Intra-band CA: Capable to aggregate 2 carriers within the same band class.

Inter-band CA: Capable to aggregate 2 carriers within different band class.



eRAN6.0 only support co-eNodeB CA with same or different coverage.



CA brings the following benefits:

Maximized utilization of time-frequency resources

CA UE can use idle resource blocks (RBs) on two CCs to minimize the waste

of resources

Efficient utilization of non-contiguous spectrum chunks

With CA, an operator's non-contiguous spectrum chunks are aggregated

for efficient utilization, especially in spectrum refarming scenarios.

Better user experience

With CA enabled in 2x2 multiple-input multiple-output (MIMO) scenarios, a

single CA UE can reach a downlink peak data rate of 300 Mbit/s.



Carrier management involves addition, activation, deactivation, and removal of an SCell for

a UE.

A2:服务小区质量低于一定门限

A4:异频邻区质量高于一定门限



The frequency information of SCell should be configured in the PCell in advanced. If UE is

capable for CA, and eNodeB will activate the measurement for SCell frequency by default.

It utilizes the specific A4 and A2 event for PCell management. The event descriptions are

the same as handover, but the threshold could be separated.

When a UE sends an A4 measurement report that contains a cell whose RSRP exceeds the

related threshold for event A4 and that is in the same CA group as the PCell, the eNodeB

delivers an RRC Connection Reconfiguration message to the UE to configure the cell as an

SCell for the UE.



After the SCell is configured for a UE, the eNodeB can take the following carrier

management actions if CarrierMgtSwitch is set to ON:

When the traffic volume of the UE is low, the eNodeB can deactivate the SCell to

reduce UE power consumed by data transmission/reception and blind decoding, as

well as overhead for uplink channel state information (CSI) reporting.

When the traffic volume of the UE is high, the eNodeB can quickly activate the

SCell to increase the UE throughput.

Otherwise, eNodeB will directly activate the Scell after configuration.



After the SCell is configured for a UE, the eNodeB can take the following carrier

management actions if CarrierMgtSwitch is set to ON:

When the traffic volume of the UE is low, the eNodeB can deactivate the SCell to

reduce UE power consumed by data transmission/reception and blind decoding, as

well as overhead for uplink channel state information (CSI) reporting.

When the traffic volume of the UE is high, the eNodeB can quickly activate the

SCell to increase the UE throughput.



PCell is changed through an RRC Connection Reconfiguration procedure, which is

equivalent to a handoverprocedure in the PCell change scenario. The SCell is added or

removed also through an RRCConnection Reconfiguration procedure, which is not a

handover procedure in the Scell configuration scenario.



CA UE sends A3 measurement reports in the PCell. The eNodeB delivers an RRC

Connection Reconfiguration message to remove the SCell and then performs an intra-

frequency handover for the UE.

If CA is enabled for the new PCell (that is, the target cell of the handover), the serving

eNodeB delivers an A4 measurement configuration to the UE after the RRC connection is

established. Later, if the UE sends A4 measurement reports that contain a cell (for example,

cell 1) in the same CA group as the new PCell, the eNodeB configures cell 1 as an Scell for

the UE.



During the inter-frequency handover, the target PCell might be the SCell in the same CA

group of the source eNodeB. As a result, it is likely that the UE is handed over from its

PCell to its SCell.



Be aware of that, two cells that are to be configured as a CA group are configured as a

neighboring cell of

each other.



Parameters description



Parameters Description

CarrAggrA2

ThdRsrp

Indicates the Reference Signal Received Power (RSRP) threshold for reporting event

A2 in a secondary cell. When the RSRP of a UE is lower than this threshold, event A2

is reported.

CarrAggrA4

ThdRsrp

Indicates the Reference Signal Received Power (RSRP) threshold for a UE to report

event A4 in a secondary cell. When the RSRP of the UE is greater than the threshold,

event A4 is reported

CarrierMgtS

witch

Indicates the carrier management switch. If this switch is turned on, a secondary

component carrier (SCC) is activated and deactivated based on the traffic volume,

which reduces the UE power consumption when a carrier aggregation (CA) UE

performs no service or a few services. If this switch is turned off, the SCC is always

active after being configured, a CA UE can use the SCC immediately when the traffic

volume is large.

ActiveBufferLenThd

Indicates the threshold for a CA UE to activate an SCell. A CA UE can active an SCell

only when its buffered data on the eNodeB exceeds this threshold.

DeactiveBuf

ferLenThd

Indicates the threshold for a CA UE to deactivate an SCell. A CA UE can deactivate an

SCell only when its buffered data on the eNodeB is smaller than this threshold.

ActiveBuffer

DelayThd

Indicates the threshold for a CA UE to activate an SCell. A CA UE can activate an

SCell only when its buffer delay on the eNodeB exceeds this threshold.

DeactiveThr

oughputThd

Indicates the threshold for a CA UE to deactivate an SCell. A CA UE can deactivate an

SCell only when its throughput is smaller than the value of this parameter.

lte eran6.0 carrier aggregation feature issue1.00

Documents

permission eran6

permission lte eran6

permission carrier management

frequency information

single ca ue

frequency resources

ca group

coenodeb ca