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Transmission time interval control

A technology of transmission time interval and maximum transmission time, applied in the field of the length of the transmission time interval, which can solve the problem of reducing the ratio of data to overhead

Active Publication Date: 2018-11-09
IPCOM GMBH & CO KG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] Therefore, reducing the TTI length while maintaining the CP length and the amount of control information reduces the data per TTI, but keeps the order of magnitude of the overhead constant, i.e., the ratio of useful data to overhead is reduced

Method used

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  • Transmission time interval control
  • Transmission time interval control
  • Transmission time interval control

Examples

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Embodiment Construction

[0039] exist figure 1 A prior art initial time alignment process between a base station and a UE is shown in . A Random Access (RA) preamble is sent by the UE to the base station BS.

[0040] The transmission time at the UE is precisely the frame boundary (FB) that has been derived from the DL signal transmitted earlier by the BS. With respect to the corresponding boundaries at the BS will be as estimated FB at the UE (e.g., figure 1 FB in 1 ) delay the DL propagation delay T caused by the separation between UE and BS p-DL . Further frame boundaries are defined by reception of further downlink signals or using UE internal timing (e.g. FB 2’ ,FB 3’ ,…).

[0041] The random access preamble transmission time is thus delayed, and reception of the RA preamble suffers the same or similar propagation delay T before being received at the BS p-UL . Therefore, the base station receives information about figure 1 FB in 2 Delayed T p-ULDL RA preamble.

[0042] BS according to...

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Abstract

The present invention provides a method of determining a transmission time interval length to be used for communications between a user equipment device and a base station in response to a new servicerequest, wherein the transmission time interval length is selected dependent on a timing advance value to be used by the user equipment device for communication with the base station.

Description

technical field [0001] The present invention relates to controlling the length of a transmission time interval in a mobile communication system. Background technique [0002] In a cellular mobile communication system, generally, uplink (UL) and downlink (DL) of a mobile device (User Equipment, UE) are time aligned. Timing alignment refers to transmission and reception at the base station BS. That is, it is considered that the signals transmitted in the same time slot in the downlink direction are simultaneously transmitted by the base station; while the signals transmitted in the same time slot in the uplink direction are transmitted by the UE in a single A single timing advance results in simultaneous reception at the base station. [0003] A Timing Advance (TA) is established and maintained between the UE and the Base Station (BS) by timing measurements in the BS and explicit signaling to the UE using the Medium Access Control Protocol (MAC). This is described, for exam...

Claims

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Application Information

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IPC IPC(8): H04W56/00H04W72/00
CPCH04W72/0446H04W56/0045H04W72/543H04B17/364H04L25/03006
Inventor M·汉斯A·施密特M·别纳斯
Owner IPCOM GMBH & CO KG