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Uplink control signaling for joint fdd and tdd carrier aggregation

A downlink, link technology used in the field of wireless telephony

Active Publication Date: 2018-10-09
TEXAS INSTR INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] On the other hand, the cost of RF spectrum is a major bottleneck in the deployment of ubiquitous and high data rate wireless communication systems

Method used

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  • Uplink control signaling for joint fdd and tdd carrier aggregation
  • Uplink control signaling for joint fdd and tdd carrier aggregation
  • Uplink control signaling for joint fdd and tdd carrier aggregation

Examples

Experimental program
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Embodiment Construction

[0011] The joint FDD and TDD design provides carrier aggregation in wireless communication systems. The signaling methodology described herein may be implemented in Orthogonal Frequency Division Multiplexing (OFDM) based cellular systems, such as LTE cellular systems, operating in FDD and / or TDD modes.

[0012] In one embodiment, the PCell operates in FDD mode and the SCell operates in TDD mode. In this configuration, the mobile device receives a physical downlink shared channel (PDSCH) from the TDD SCell in subframe n and transmits a hybrid automatic repeat request acknowledgment (HARQ ACK) to the FDD PCell in subframe n+4.

[0013] In another embodiment, the PCell operates in TDD mode and the SCell operates in FDD mode. In this configuration, the mobile device receives the PDSCH from the FDD SCell in the downlink subframe and transmits the HARQ ACK corresponding to the PDSCH to the TDD PCell in the selected uplink subframe. The selected uplink subframe may be the first val...

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Abstract

In the depicted example, a connection is established to a first serving cell (101) designated as the primary serving cell PCell, and a connection is established to a second serving cell (105) designated as the secondary serving cell SCell. The SCell (105) uses a different duplex mode from the PCell (101). The duplex modes of the PCell (101) and SCell (105) are selected from FDD and TDD modes. The mobile device receives a subframe scheduling message for the SCell (105) in a downlink subframe and selects an uplink subframe based on the duplex mode of the PCell (101) to send a scheduling message reply.

Description

[0001] The present invention relates generally to wireless communications, and more particularly to wireless telephony. Background technique [0002] A cellular wireless network consists of multiple base stations. Each of these base stations transmits (downlink or DL) to and receives (uplink or UL) from mobile users in its coverage area. The surge in data traffic in wireless cellular networks has created a need for rapid expansion of network capacity to cope with increasing user demands. Carrier aggregation provides a method for increasing network capacity. With carrier aggregation, a base station simultaneously transmits data to or receives data from mobile user equipments (UEs) on multiple carriers in the same or different RF frequency bands. For example, in cellular systems conforming to the 3rd Generation Partnership Project (3GPP) Long Term Evolution (LTE) standard, carrier aggregation has been standardized in LTE releases 10 and 11 for both in-band and inter-band opera...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04J4/00H04L1/16H04L5/14
CPCH04L5/001H04L5/143H04L5/1469H04L5/0055H04L5/0035H04L1/1861H04W76/15H04W72/23
Inventor 安东尼·埃德特·埃克佩荣
Owner TEXAS INSTR INC