Extended HSUPA coverage and enhanced battery saving opportunities with multiple TTI lengths

Laakso, Frans; Aho, Kari; Repo, Ilmari; Chapman, Thomas

doi:10.1109/pimrc.2010.5671607

Cited by 4 publications

(5 citation statements)

References 11 publications

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“…. Moreover, as [2] indicates with 2 ms TTI and thus with RE the power saving opportunities are much higher than with 10 ms TTI. Taking both the improvement in capacity and the minor increase in transmit antenna activity into account, the benefits offered by RE mode clearly outweigh the negative effects.…”

Section: B Quality Of Service Criteria For Voipmentioning

confidence: 94%

“…Previous studies regarding HSUPA (VoIP) performance have focused on various performance enhancing techniques, such as Discontinuous DPCCH transmissions (UL DTX), i.e., Dedicated Physical Control Channel (DPCCH) gating, see, e.g., [2] [3] [4] [5] and [6]. These extensive studies for VoIP have shown noticeable gains in terms of capacity, battery savings and meeting the delay requirements.…”

Section: Motivation and Related Studiesmentioning

confidence: 99%

“…In [2] coverage when both 10 ms and 2 ms TTIs are present in the system and can be configured to be used depending on the UEs path loss are investigated. The results indicate that a "mixed" TTI approach offers extended coverage with good battery saving opportunities when compared to normal 2 ms TTI performance.…”

Section: Motivation and Related Studiesmentioning

confidence: 99%

“…Release 7 addresses this problem with discontinuous DPCCH transmissions [7] [8]. With UL DTX the transmission of DPCCH is controlled by data transmissions and various different timers which are introduced in more detail in [2] [7] and [8]. This approach provides increased battery saving opportunities during the times when turning off the transmit circuitry is possible, i.e., no data or mandatory control transmissions are present.…”

Section: Discontinous Dpcch Transmissionsmentioning

confidence: 99%

“…. The proposed range extension scheme is benchmarked by using a quasi-static time driven system simulator, also utilized in, e.g., [2] [3] [4] [6]. All necessary RRM algorithms as well as their interactions are modeled in the simulator and detailed simulation of the users within multiple cells is included.…”

Section: Harq Operation With 2 Ms Tti Range Extensionmentioning

confidence: 99%

See 4 more Smart Citations

Streamlining HSUPA TTI Lengths without Compromising HSUPA Capacity

Laakso

Aho

Repo

et al. 2011

2011 IEEE 73rd Vehicular Technology Conference (VTC Spring)

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This paper proposes a s.c. 2 ms range extension scheme for High Speed Uplink Packet Access (HSUPA) networks to avoid potential coverage problems and usage of multiple TTI lengths. With range extension UEs in poor radio conditions are configured to send bundles of 2 ms TTI transmissions without HARQ feedback to improve their coverage. This paper analyzes the performance of range extension in comparison with normal 2 ms TTI performance with multiple inter-site distances. The analysis is conducted considering VoIP performance due to its high sensitivity to additional delays and packet loss. The results acquired by using system level simulation tool indicate that using 2 ms range extension can improve system capacity in larger cells where normal 2 ms TTI can result into coverage problems. Moreover, utilizing repeated 2 ms TTIs instead 10 ms TTIs enables increased battery saving opportunities when UL DTX is applied.

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Section: B Quality Of Service Criteria For Voipmentioning

confidence: 94%