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Coordination of duplex directions in nr TDD system

A transmission direction, time division duplex technology, applied in transmission systems, digital transmission systems, duplex signal operations, etc., can solve problems such as inefficiency and waste, achieve rapid coordination, avoid erroneous transmission, enhance downlink and Effects of Uplink Performance

Active Publication Date: 2019-08-23
TELEFON AB LM ERICSSON (PUBL)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This would be very inefficient (especially when there is only one direction of traffic) as another dedicated time resource for the other direction is wasted

Method used

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  • Coordination of duplex directions in nr TDD system
  • Coordination of duplex directions in nr TDD system
  • Coordination of duplex directions in nr TDD system

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0033] Embodiment 1: Centralized Adaptive TDD Mode Switching

[0034] The first embodiment provides centralized TDD mode switching between dynamic TDD and predetermined static TDD. In order to coordinate a group of cells, a logical central entity can be introduced which employs a joint traffic direction scheduler for all cells in the coordination group. The logical central entity may be, for example, an additional inter-cell cell scheduling function on top of an existing cell-level scheduler. For example, it can be implemented in a baseband processor covering multiple remote radio units.

[0035] Transceivers for a group of cells may be located at the same site. The joint direction scheduler collects information from each cell and indicates, for a Transmission Time Interval (TTI) during a certain time period, the transmission direction to be used at all cells in the group. Indicating the transmission direction for TTI can be done by indicating TDD mode.

[0036] Based on t...

Embodiment 2

[0043] Example 2: Trigger for Adaptive Transmission Direction

[0044] This embodiment provides a trigger mechanism for switching or turning on / off the TDD mode for cells in the coordination group. As a non-limiting example, this may be done based on a change in the buffer status of any of the cells in the group. The status of the buffers in each cell can be reported to the central entity periodically or in an event-based manner. For example, if any neighboring cell in the coordination group has traffic in both DL and UL directions, or any neighboring cell has traffic in a direction different from the most recently scheduled one, the central entity sends a mode selection signal to all cells , in order to ensure the use of a predetermined static TDD pattern that avoids intra-site cross-link interference. Also, when all neighboring cells have data only in the same traffic direction, it can send another signal to switch off the static TDD mode in order not to waste unused resou...

Embodiment 3

[0048] Embodiment 3: Timing Aspects of Transmission Direction Signaling

[0049] Another embodiment provides timing aspects for signaling of the direction of transmission. Signaling can be used on very fast timescales (e.g. TTI level) (which is feasible if all cells are physically connected in close proximity with a dedicated backhaul), or on relatively long-term timescales (such as file Arrival) to use. This different time scale can be applied for triggering information updates for the central entity and for transmission direction signaling from the central entity. In other words, trigger information updates to the central entity can be done more frequently, but transmission direction signaling (eg in the form of TDD mode to use) can be done on a slower time scale.

[0050] In a variation of this embodiment, when signaling the TDD mode, the TTI boundaries for the DL:UL ratio alignment are also signaled explicitly or implicitly. Therefore, consider TDD mode to operate with ...

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PUM

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Abstract

A method performed in a system comprising a joint traffic direction scheduler configured to coordinate time-division-duplex (TDD) transmissions for multiple cells comprises obtaining TDD operation information from each of the cells, determining, based on the obtained TDD operation information, a transmission direction to be used by each of the cells during one or more transmission time intervals (TTIs), and indicating to the cells the determined transmission direction.

Description

[0001] Cross References to Related Applications [0002] This application claims priority to U.S. Provisional Patent Application No. 62 / 444,271, filed January 9, 2017, the subject matter of which is hereby incorporated by reference. technical field [0003] The disclosed subject matter generally relates to telecommunications. Certain embodiments relate more specifically to the coordination of duplex directions in New Radio (NR) Time Division Duplex (TDD) systems. Background technique [0004] In the 3rd Generation Partnership Project (3GPP) there is an ongoing research project investigating new radio interfaces for fifth generation telecommunication systems (5G). The terminology used to denote this new next-generation technology has not yet been agreed upon, so the terms NR and 5G are used interchangeably. Also, a base station may be referred to as a gNB instead of an eNB. Alternatively, the term Transmit Reception Point (TRP) may also be used. Also, the term Access Poin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W24/02H04W28/18H04W72/04
CPCH04L5/1469H04L5/16H04W24/02H04W28/18H04W72/0446H04W72/29
Inventor 姜斗镐J-F·程H·考拉帕蒂S·法拉哈蒂
Owner TELEFON AB LM ERICSSON (PUBL)