US 2019/0104547 A1Published application

Asynchronous spatial lbt

AssigneeQUALCOMM Incorporated

InventorsYisheng Xue, Xiaoxia Zhang, Siddhartha Mallik, Aleksandar Damnjanovic

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Abstract

Improvements to asynchronous spatial listen before talk (LBT) procedures are disclosed. In a shared spectrum network spatial LBT procedures are used for directionally targeting the channel reservation process. Prior to transmitting channel reservation signaling, the transmitter and receiver determine an effective interference considering available multiple input, multiple output (MIMO) configuration information. When the effective interference exceeds a predefined threshold, the node may without transmission of its channel reservation signal. Otherwise, when the effective interference remains within the threshold, each node's transmitted channel reservation signal may also identify at least a beamforming matrix either as payload or used to precede the node's channel reservation signal.

Claims30

Dependent claims

A method of wireless communication, comprising:

requesting, by a base station, a non-precoded sounding reference signal (SRS) from one or more served user equipments (UEs) at one or more intervals;
determining, by the base station, a channel estimate to each of the one or more served UEs using the non-preceded SRS received from the one or more served UEs;
computing, by the base station, multiple input, multiple output (MIMO) configuration information for the base station based on one or more of the channel estimate and a running average of interference covariance, Rnn, from the one or more served UEs;
performing, by the base station, an enhanced clear channel assessment (eCCA) using a first random contention window value, wherein the eCCA is performed on a shared communication channel;
transmitting, by the base station, a spatial channel reservation signal on the shared communication channel to at least one of the one or more served UEs in response to success of the eCCA, wherein the spatial channel reservation signal identifies the MIMO configuration information, including at least a transmit beamforming (TxBF) directional parameter;
and
transmitting, by the base station, data on the shared communication channel to the at least one of the one or more served UEs in response to a spatial channel reservation response signal received from the at least one of the one or more served UEs.

4 more elements

A method of wireless communication, comprising:

receiving, by a user equipment (UE), a spatial channel reservation signal from a serving base station, wherein the spatial channel reservation signal identifies multiple input, multiple output (MIMO) configuration information, including at least a transmit beamforming (TxBF) parameter;
performing, by the UE, a clear channel assessment (CCA) on a shared communication channel;
transmitting, by the UE, a spatial channel reservation response signal to the serving base station in response to success of the CCA, wherein the spatial channel reservation response signal identifies at least a receive beamforming (RxBF) directional parameter;
and
receiving, by the UE after transmission of the spatial channel reservation response signal, data transmissions from the serving base station on the shared communication channel.

2 more elements

A method of wireless communication, comprising:

computing, by a base station, multiple input, multiple output (MIMO) configuration information for the base station to at least one user equipment (UE) scheduled for uplink transmissions, wherein the MIMO configuration information is based one or more of a channel estimate and a current interference covariance, Rnn, from the at least one UE;
performing, by the base station, an enhanced clear channel assessment (eCCA) using a first random contention window value, wherein the eCCA is performed on a shared communication channel;
transmitting, by the base station, a spatial channel reservation signal on the shared communication channel to a first UE of the at least one UE in response to success of the eCCA, wherein the spatial channel reservation signal identifies the MIMO configuration information, including at least a receive beamforming (RxBF) directional parameter;
and
receiving, by the base station, the uplink transmissions from the first UE on the shared communication channel in response to a spatial channel reservation response signal received from the first UE.

2 more elements

A method of wireless communication, comprising:

transmitting, by a user equipment (UE), an uplink scheduling request for uplink transmissions to a serving base station;
receiving, by the UE, a spatial channel reservation signal from the serving base station, wherein the spatial channel reservation signal identifies multiple input, multiple output (MIMO) configuration information, including at least a receive beamforming (RxBF) directional parameter;
performing, by the UE, a clear channel assessment (CCA) on a shared communication channel;
transmitting, by the UE, a spatial channel reservation response signal to the serving base station in response to success of the CCA, wherein the spatial channel reservation response signal identifies at least a transmit beamforming (TxBF) directional parameter;
and
transmitting, by the UE after transmission of the spatial channel reservation response signal, the uplink transmissions to the serving base station on the shared communication channel.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application: 16/141,616Filed 25 Sep 2018
Priority: 2 Oct 2017
Published: 4 Apr 2019
Term ends: Not estimatedThe source records don’t support an estimate.

Classification29 codes

H04W 74/0808
Non-scheduled access, e.g. ALOHA: using carrier sensing, e.g. carrier sense multiple access [CSMA]
B30B 11/18
Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses:…
B31B 70/645
By applying heat or pressure: making seals transversally to the direction of movement
B31B 70/8135
Applying strings; Making string-closed bags: the strings being applied in the machine direction