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Physical Resource Block Allocation for Physical Downlink Control and Data Channels

A technology of physical downlink and control channel, applied in the field of downlink transmission, which can solve the problems of low complexity, inability to receive the total system bandwidth, etc.

Active Publication Date: 2021-09-28
TELEFON AB LM ERICSSON (PUBL)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A low complexity UE with a reduced UE bandwidth of 1.4 MHz to be introduced in LTE Rel-13 may not be or will be able to receive a total system bandwidth of 20 MHz

Method used

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  • Physical Resource Block Allocation for Physical Downlink Control and Data Channels
  • Physical Resource Block Allocation for Physical Downlink Control and Data Channels
  • Physical Resource Block Allocation for Physical Downlink Control and Data Channels

Examples

Experimental program
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Embodiment Construction

[0025] Such as figure 1 As shown in , LTE uses OFDM in the downlink and DFT-spread OFDM in the uplink. Thus, the basic LTE downlink physical resource can be viewed as a time-frequency grid, where each resource element corresponds to one OFDM subcarrier during one OFDM symbol interval.

[0026]In this application, MTC devices are used as examples in discussion and description. The methods and apparatus disclosed herein are equally applicable to other types of wireless devices. A wireless device can operate in a bandwidth that is narrower than the system bandwidth. In this application, a wireless device operating in a bandwidth narrower than the system bandwidth is also referred to as a low complexity UE. When referred to herein, a wireless device may refer to a machine-to-machine (M2M) device, a machine-type communication (MTC) device, and / or a NB-IoT device. A wireless device may also be a UE, but it should be noted that a UE does not necessarily have a "user" in the sense...

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PUM

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Abstract

Methods and apparatus are disclosed for enabling narrowband MTC devices to operate in legacy LTE systems with wider system bandwidth. The Physical Downlink Control Channel for narrowband MTC devices, also known as Low Complexity Physical Downlink Control Channel (LC‑PDCCH), has reduced bandwidth resources and can support no more than 6 physical resource blocks. This application discloses how to allocate Physical Resource Blocks (PRBs) for LC-PDCCH and Physical Downlink Shared Channel (PDSCH). The PRB allocation method disclosed herein allows the MTC device to derive the frequency location of the PDSCH PRB from the frequency location of the LC-PDCCH PRB and to soft-combine the LC-PDCCH transmission and the PDSCH transmission in order to improve performance.

Description

technical field [0001] In general, the present disclosure relates to downlink transmissions by wireless devices, and more particularly, to allocation of physical resource blocks for physical downlink control channels and data channels for downlink transmissions to wireless devices. Background technique [0002] Machine Type Communication (MTC) is an important revenue stream for operators and has huge potential from an operator perspective. It is useful for operators to be able to serve MTC user equipment (UE) (also called MTC devices in this application) with already deployed radio access technologies. Accordingly, 3GPP Long Term Evolution (LTE) has been investigated as a competing radio access technology for effectively supporting MTC operation. Reducing the cost of MTC UEs is an important enabler for realizing the "Internet of Things" concept. Many MTC applications require low operating UE power consumption and are expected to communicate in infrequent small burst transm...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W72/04H04L5/00H04L1/18H04L27/26H04W4/70
CPCH04W72/0453H04L5/0044H04L5/0048H04L5/0053H04L5/0094H04L27/2602H04L1/1861H04W4/70H04L27/2603H04W72/23H04L5/0051
Inventor Y.布兰肯斯普A.格雷夫伦J.伯格曼
Owner TELEFON AB LM ERICSSON (PUBL)