Configuration of non-orthogonal dmrs for uplink transmission

A link, user equipment technology, applied in the field of accurate

Pending Publication Date: 2020-10-30
QUALCOMM INC
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this approach is not always feasible for NOMA due to the large number of DMRS sequences required to support a large number of UEs typically in a wireless communication system

Method used

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  • Configuration of non-orthogonal dmrs for uplink transmission
  • Configuration of non-orthogonal dmrs for uplink transmission
  • Configuration of non-orthogonal dmrs for uplink transmission

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Embodiment Construction

[0027] As described above, the uplink DMRS design affects the uplink channel estimation accuracy for PUSCH, and thus the reliability and throughput of uplink transmissions. In order to support a large number of UEs that are typically part of a wireless communication system, current systems require a large number of DMRS sequences to minimize traffic collisions between multiple UEs transmitting using the same DMRS sequence. However, this approach is not always possible.

[0028] Specifically, as shown in Table 1 below, the table shows the requirements for the number of DMRS sequences for various collision probabilities. In order to achieve a low collision probability, a large DMRS pool is required.

[0029]

[0030]

[0031] Table 1.0

[0032] (Number of DMRSs required for a given packet arrival rate in one time and frequency resource)

[0033] For example, for license-free UL transmission, a large number of different DMRS sequences are required to support a large numbe...

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Abstract

Aspects of the present disclosure provide techniques for grouping demodulation reference signal (DMRS) sequences for uplink transmission without grant based on one or more of cross correlation of sequences, the cubic metric or peak-to-average power ratio (PAPR). In accordance with this technique, the power control for transmissions of DMRS can also be exploited to enhance sequence grouping. Features of the present disclosure may prepare a composite sequence that is generated by concatenating two base sequences. In this instance, the base station may provide UEs with a pool of base sequences. For transmission of DMRS, the UEs may select two base sequences that may be transmitted in two consecutive slots or two DMRS symbols in a slot. By allowing the UE to select two base sequences, the network may reduce the probability of a collision that may occur when two UEs select the same base sequence.

Description

[0001] claim of priority [0002] This patent application claims priority to International Patent Application No. PCT / CN2018 / 075955, filed on February 9, 2018 and assigned to the assignee, entitled "CONFIGURATION OFNON-ORTHOGONAL DMRS FOR NOMA", and expressly expressly incorporated by reference. Background technique [0003] Aspects of the present disclosure relate generally to wireless communication networks, and more particularly to a demodulation reference signal (DMRS) design for L1 grant-free uplink transmission using non-orthogonal multiple access (NOMA). [0004] Wireless communication systems are widely deployed to provide various telecommunication services such as telephony, video, data, messaging, and broadcast. A typical wireless communication system may adopt a multiple access technology capable of supporting communication with multiple users by sharing available system resources (eg, bandwidth, transmission power). Examples of such multiple access techniques inc...

Claims

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Application Information

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IPC IPC(8): H04W72/04
CPCH04L5/0051H04L5/0053H04L27/261H04L27/2614H04L5/0048H04W52/325H04W72/21
Inventor 魏超李乔羽程鹏
Owner QUALCOMM INC
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