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HOME > News> Mobility of HSDPA and

Mobility of HSDPA and

2016-12-19 09:50

HSDPA mobility: In HSDPA, the introduction of the HS-DSCH channel, the design mechanism is not soft-switching, that is, in the high-speed data transmission, while only one Serving Cell service. In the R5, the change of the HS-DSCH Serving Cell can only be realized by the physical channel reconfiguration process. When the UE detects the strength of the neighbor cell satisfying the Active Set condition (measurement event 1a), the HS-DSCH channel Before you create, first update the Active Set. R6 in the ServingHS-DSCH cell changes through the Active Set update process.


HSDPA supports compressed mode, the UE can be inter-system and inter-frequency measurements. However, the HS-DSCH channel does not implement any compression mode, in the compressed mode that frame, the data may be lost or transmission pause.


The current alternative solution is to have HS-DSCH data temporarily transmitted in DCH mode in compressed mode and to achieve compression mode and inter-system handover at reduced transmission rate.


HSUPA Mobility: HSDPA and HSUPA different design concepts, resulting in some very different implementation of the switch, there is no dependency between them, from R99 can be upgraded to any system, this is not an ideal road, in the LTE era, I hope the uplink and downlink technology to develop a more unified evolution of thinking. In R99, in order to achieve better power control purposes, DCH Active Set size of 6, which is a user at the same time and up to 6 cells remain connected. In HSUPA, this does not improve the uplink transmission efficiency, and HSUPA many scheduling and retransmission are down to the NodeB, so there is no need to maintain and so many areas of contact, HSUPA Active Set maximum of 4.


For the compressed mode, in 2msTTI, HSUPA processing ideas similar to HSDPA, that is compressed in the data when the delay, and then transmitted. For 10msTTI, in the transmission of data, can be used to send the first time to use compressed mode, the loss of compressed GAP part of the data in the second retransmission when all the data transmission can also be used to send the first transmission of all data, the second retransmission using compressed mode, The data of the compressed GAP portion is discarded.


In addition, the introduction of E-DCH makes the Active Set maintained by HSUPA terminals include two types of cells, one is E-DCH and the other is DCH. The cell in E-DCH Active Set must be DCH Active Set in the district, otherwise not established. HSUPA implements the update of the servingE-DCH cell by the measurement of event 1d, which is analogous to HSDPA.


 HSDPA mobility: In HSDPA, the introduction of the HS-DSCH channel, the design mechanism is not soft-switching, that is, in the high-speed data transmission, while only one Serving Cell service. In the R5, the change of the HS-DSCH Serving Cell can only be realized by the physical channel reconfiguration process. When the UE detects the strength of the neighbor cell satisfying the Active Set condition (measurement event 1a), the HS-DSCH channel Before you create, first update the Active Set. R6 in the ServingHS-DSCH cell changes through the Active Set update process.


HSDPA supports compressed mode, the UE can be inter-system and inter-frequency measurements. However, the HS-DSCH channel does not implement any compression mode, in the compressed mode that frame, the data may be lost or transmission pause.


The current alternative solution is to have HS-DSCH data temporarily transmitted in DCH mode in compressed mode and to achieve compression mode and inter-system handover at reduced transmission rate.


HSUPA Mobility: HSDPA and HSUPA different design concepts, resulting in some very different implementation of the switch, there is no dependency between them, from R99 can be upgraded to any system, this is not an ideal road, in the LTE era, I hope the uplink and downlink technology to develop a more unified evolution of thinking. In R99, in order to achieve better power control purposes, DCH Active Set size of 6, which is a user at the same time and up to 6 cells remain connected. In HSUPA, this does not improve the uplink transmission efficiency, and HSUPA many scheduling and retransmission are down to the NodeB, so there is no need to maintain and so many areas of contact, HSUPA Active Set maximum of 4.


For the compressed mode, in 2msTTI, HSUPA processing ideas similar to HSDPA, that is compressed in the data when the delay, and then transmitted. For 10msTTI, in the transmission of data, can be used to send the first time to use compressed mode, the loss of compressed GAP part of the data in the second retransmission when all the data transmission can also be used to send the first transmission of all data, the second retransmission using compressed mode, The data of the compressed GAP portion is discarded.


In addition, the introduction of E-DCH makes the Active Set maintained by HSUPA terminals include two types of cells, one is E-DCH and the other is DCH. The cell in E-DCH Active Set must be DCH Active Set in the district, otherwise not established. HSUPA implements the update of the servingE-DCH cell by the measurement of event 1d, which is analogous to HSDPA.


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