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Apparatus and method for link adaptation in uplink grant-less random access

A link adaptive and random access technology, which is applied in transmission modification based on link quality, error detection/prevention using signal quality detectors, wireless communication, etc., can solve problems such as reduced effective use of spectrum

Active Publication Date: 2018-01-19
HUAWEI TECH CO LTD
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Problems solved by technology

However, using a very robust MCS may not always be necessary, and when not necessary, using a very robust MCS can lead to a reduction in efficient use of the spectrum
Currently, there are no mechanisms that allow for increased efficiency in random access data communications

Method used

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  • Apparatus and method for link adaptation in uplink grant-less random access

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Embodiment Construction

[0023] The making and using of the presently preferred embodiments are discussed in detail below. It should be appreciated, however, that the present invention provides many applicable inventive concepts that can be embodied in a wide variety of specific contexts. The specific embodiments discussed are merely illustrative of specific ways to make and use the invention, and do not limit the scope of the invention.

[0024] Embodiments of systems and methods for link adaptation schemes in uplink unlicensed random access (RA) are provided herein. The scheme includes changing the MCS assigned to the user equipment (UE) due to UE link / channel conditions changing during RA communication, instead of using a fixed MCS scheme (eg, typically a robust scheme such as QSPK). The methods and systems disclosed herein perform link adaptation based on uplink and long-term measurements of UE's signal quality. As used herein, the term UE refers to any device capable of connecting to a wireless...

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Abstract

Embodiments are provided for a scheme of link adaptation (LA) in uplink grant-less random access (RA) communications. The scheme includes changing a modulation and coding (MCS) of a user, instead of using a fixed MCS over time, as the user link, channel, or non-link conditions vary during the RA communications. In an embodiment, a transmission point (TP) receives from a UE a packet encoded using aMCS, and detects a condition associated with uplink measurements or other non-link based condition of the UE. The TP then initiates an upgrade or a downgrade of the MCS in accordance with the condition, and signals the UE indicating a second MCS as a result. The UE thus sends a second packet encoded using the second MCS. In another embodiment, the UE initiates the MCS change in accordance to detecting a link or non-link based condition, such as change of mobility.

Description

[0001] Cross References to Related Applications [0002] This application claims priority to U.S. Patent Application Serial No. 14 / 724,569, filed May 28, 2015, and entitled "Apparatus and Method for Link Adaptation in Uplink Unlicensed Random Access" , the contents of which are incorporated herein by reference. technical field [0003] The present invention relates to wireless communications, and in particular embodiments to apparatus and methods for link adaptation in uplink unlicensed random access. Background technique [0004] In evolved and next-generation wireless networks, uplink grant-less random access (RA) schemes can be used to reduce signaling overhead and support services and applications with strict delay requirements. For example, for applications such as gaming or live video streaming, live streaming requires very low latency and reliable delivery. For the random access scheme in the uplink, a sparse-code-multiple access (SCMA) technology may be used to ove...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/00
CPCH04W74/0833H04L1/0003H04L1/0009H04L1/0026H04L1/0016H04L1/0025H04L5/0057H04L5/006H04B7/18543Y02D30/50H04L1/20H04W88/02H04W88/08
Inventor 张立清凯文·卡·勤·欧马江镭
Owner HUAWEI TECH CO LTD
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