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Hybrid frequency and time duplexing communications

A duplex and wireless communication system technology, applied in the direction of duplex signal operation, wireless communication, signaling distribution, etc., can solve the problems of expensive and slow, and achieve the effect of optimizing throughput and efficient spectrum management

Inactive Publication Date: 2020-01-07
TELEFON AB LM ERICSSON (PUBL)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Generally, without the availability of channel reciprocity, network nodes must rely on feedback from wireless devices, such as channel quality reports, which is a slow and expensive process

Method used

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  • Hybrid frequency and time duplexing communications
  • Hybrid frequency and time duplexing communications
  • Hybrid frequency and time duplexing communications

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0056] Example 1: Hybrid Time Division Duplex and Frequency Division Duplex

[0057] In this embodiment, the duplex scheme is a hybrid of traditional FDD and TDD schemes, where FL and RL resource allocation alternates cyclically across frequency and time partitions. For example, refer to figure 2 , consider snapshots of three adjacent slots (denoted as slots 1, 2, and 3). Also consider two different but not necessarily adjacent frequency bands (denoted as frequency bands A and B) in each slot. In slot 1, frequency band A is used for DL ​​or FL communication, and frequency band B is used for UL or RL communication. Then, in slot 2, these assignments are reversed, and finally in slot 3, they are the same as in slot 1.

[0058] This technique of FL and RL switching from one slot to the next facilitates reciprocity-based algorithms that were previously possible only for pure TDD systems, but not for FDD systems. Specifically, base station 14 may measure the RL channel of a ...

Embodiment 2

[0082] Embodiment 2: Payload scheduling across frequency bands

[0083] In multi-band configurations considered for hybrid duplex schemes, base station 14 can strategically place RL (i.e., uplink or sidelink) and FL (i.e., downlink or sidelink) across these frequency bands and across multiple time slots. sidelink) transmission in order to optimize network performance goals such as coverage, throughput, etc. In this embodiment, techniques for correlating payloads for these frequency bands are provided.

[0084] separation

[0085] The concept of transmit diversity is well understood in the telecommunications community. It involves sending multiple copies or variations of the same payload on different channels across frequency, time or space. In LTE, spatial diversity is employed and captured in various transmission modes (TMs) (eg, TM2 and TM3). Here, diversity is used in mixed duplex systems. Specifically, the same or different copies of a particular wireless device's...

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Abstract

A method, network node and wireless device configured for allocating resources for reverse link transmissions from a second network node to a first network node and forward link transmissions from thefirst network node to the second network node in a wireless communication system are disclosed. According to one aspect, the method includes selecting a per-band duplexing cadence for each of at least two frequency bands, a duplexing cadence defining a forward link / reverse link pattern of adjacent successive time slots. The method also includes allocating each of the at least two frequency bandsto one of forward link and reverse link transmission in each of adjacent successive time slots according to the per-band duplexing cadence for the frequency band.

Description

technical field [0001] The present invention relates to wireless communications, and more particularly to mixed frequency and time duplexing. Background technique [0002] Traditionally, there are two main duplex arrangements in today's wireless communications: frequency division duplex (FDD) and time division duplex (TDD). Radio spectrum regulation by national administrations typically promotes either or both of these arrangements in different spectrum operating bands and in different regions of the world. [0003] For TDD operation, unpaired frequency bands are allocated, and uplink (from the wireless device to a network node such as a base station) and downlink ( from network nodes such as base stations to wireless devices). TDD deployment has evolved from being statically / semi-statically configurable in 4th Generation Long Term Evolution (4G LTE) systems to being dynamically configurable in 5th Generation New Radio (5G NR) systems. [0004] For FDD operation, paired f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L5/00H04L5/14
CPCH04L5/003H04L5/14H04L1/0004H04L1/1819H04L5/0055H04L5/1469H04W72/02H04W72/0446H04W72/0453H04W92/18
Inventor T.艾哈迈德S.吉布森俞东生
Owner TELEFON AB LM ERICSSON (PUBL)
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