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Short tti patterns

A transmission time interval and terminal technology, applied in transmission systems, wireless communications, electrical components, etc., can solve problems such as performance being limited by delays

Active Publication Date: 2019-04-02
TELEFON AB LM ERICSSON (PUBL)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Performance is latency limited during TCP slow start

Method used

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  • Short tti patterns
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Examples

Experimental program
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Embodiment Construction

[0027] A short (shorter) TTI may be decided to be of arbitrary duration and include resources over multiple OFDM or SC-FDMA symbols within a 1 ms SF. As an example, the duration of a short TTI may be 0.5 ms, ie seven OFDM or SC-FDMA symbols with a normal cyclic prefix. As another example, a short TTI may be two symbols in duration. An sTTI can be considered to have a duration of between one, preferably two and seven symbols. The TTI pattern can be adjusted accordingly to cover the sTTI duration. An LTE subframe includes two time slots, and each time slot has a duration of 0.5 ms. Typically, symbols 0 to 6 are associated with the first slot (slot 0) and symbols 7 to 13 are associated with the second slot (slot 1).

[0028] CSI-RS is an example of reference signaling. A channel state information reference signal (CSI-RS) is a cell-specific signal that spans two consecutive symbols in the downlink, such as figure 1 shown. There may be 20 different CSI-RS positions in a subf...

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Abstract

There is disclosed a method of operating a terminal (10) in a wireless communication network, the method comprising receiving and / or transmitting according to a transmission time interval, TTI, configuration, the TTI configuration indicating at least one short transmitting time interval having between one or two and seven symbols of duration in a subframe. There are also disclosed related methodsand devices.

Description

technical field [0001] The present disclosure relates to wireless communication technologies, especially in the context of short transmission time intervals. Background technique [0002] Packet data latency is one of the performance metrics regularly measured by providers, carriers, and end users (via speed test applications). Latency measurements are taken at all stages of the radio access network system life cycle when validating new software releases or system components, when the system is deployed, and when the system is in commercial operation. [0003] Shorter latency than previous generations of 3GPP RATs is a performance metric guiding the design of Long Term Evolution (LTE). LTE is also now recognized by end users as a system that provides faster Internet access and lower data latency than previous-generation mobile wireless technologies. [0004] Packet data latency is not only important for perceived system responsiveness, it is also a parameter that indirectl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W72/04H04L1/16
CPCH04W4/20H04W80/06H04W72/0446H04L1/1887H04L1/1896H04L5/003H04L5/005H04L5/0051H04L5/0057H04L1/16H04W72/23H04L1/1812
Inventor H·萨林李静雅G·维克斯特罗姆N·安德加特L·法尔科内蒂D·拉松
Owner TELEFON AB LM ERICSSON (PUBL)