Spreading options for non-orthogonal multiple access

• US 10,560,959 B2
• Filed: 11/30/2016
• Issued: 02/11/2020
• Est. Priority Date: 02/09/2016
• Status: Active Grant

• Current Assignee: Apple Inc.
• Original Assignee: Apple Inc.
• Inventors: Kumar, Utsaw, Kwon, Hwan-Joon
• Primary Examiner(s): Anwar, Mohammad S
• Application Number:
  US16/068,754
• Publication Number:
  US 20190029031A1
• Time in Patent Office: 1,168 Days
• CPC Class Codes: H04B 1/713 using frequency hopping
• CPC Class Codes: H04L 5/003 Arrangements for allocating sub-channels of the transmission path
• CPC Class Codes: H04L 5/0064 Rate requirement of the data, e.g. scalable bandwidth, data priority
• CPC Class Codes: H04L 67/12 specially adapted for proprietary or special-purpose networking environments, e.g. medical networks, sensor networks, networks in vehicles or remote metering networks
• CPC Class Codes: H04W 28/0278 using buffer status reports dynamic wireless traffic scheduling definition H04W72/12
• CPC Class Codes: H04W 72/21 in the uplink direction of a wireless link, i.e. towards the network

Abstract

A network device (e.g., an evolved Node B (eNB), user equipment (UE) or the like) can operate to enable scheduling of transmissions within physical resource blocks (PRBs) as a non-orthogonal multiple access (NOMA) zone and as an orthogonal multiple access (OMA) zone to enable multiplexing UEs over a long term evolution (LTE) or next generation (NextGen) 5G based network for uplink transmissions. A first UE of the UEs can be scheduled to generate uplink transmissions from PRBs within the NOMA zone without an explicit grant message based on predefined threshold of a first transmission packet size or a first transmission rate. Another UE can also be scheduled to utilize resources of the NOMA zone or the OMA zone based on the predefined threshold.

Claims

1. An apparatus configured to be employed in an evolved NodeB (“

eNB”

) comprising;

one or more processors configured to;

designate a first plurality of physical resource blocks (“

PRBs”

) as a non-orthogonal multiple access (“

NOMA”

) zone and a second plurality of PRBs as an orthogonal multiple access (“

OMA”

) zone to enable multiplexing user equipments (“

UEs”

) for uplink transmissions;

schedule a first UE of the UEs to generate the uplink transmissions among the first plurality of PRBs within the NOMA zone without an explicit grant message based on a first transmission packet size or a first transmission rate;

enable the first UE to transmit data without the explicit grant message by using the first plurality of PRBs as long as the first transmission packet size of the data, or the first transmission rate of the data is smaller than a predefined threshold;

signal the predefined threshold to the first UE via explicit signaling and as an Internet of Things (“

IoT”

) threshold associated with an IoT standard for the first transmission packet size or the first transmission rate; and

schedule the first UE to generate a different transmission in the OMA zone with an explicit grant message by using the second plurality of PRBs based on the first transmission packet size or the first transmission rate reaching or exceeding the IoT threshold; and

a radio frequency (RF) interface, coupled to the one or more processors, configured to receive or transmit transmission data with an RF circuitry.

2. The apparatus of claim 1, wherein the one or more processors are further configured to schedule a second UE to generate a second transmission in the OMA zone with an explicit grant message by using the second plurality of PRBs based on a contention-based protocol, and at least one of a second transmission packet size or a second transmission rate satisfying a predefined threshold.

3. The apparatus of claim 1, wherein the one or more processors are further configured to:

receive a request for the explicit grant message to enable the transmission within the OMA zone, wherein the request is based on a transmission comprising larger packets using larger resources than resources designated within the NOMA zone; and

transmit an indication with the explicit grant message that the first UE is designated as being in the OMA zone based on the first transmission packet size of the data, or the first transmission rate of the data satisfying the IoT threshold.

4. The apparatus of claim 1, wherein the request to enter the OMA zone is included in a buffer status report (“

BSR”

).

5. The apparatus of claim 1, wherein the one or more processors are further configured to:

divide the UEs into a plurality of UE groups, coupled to a long term evolution (“

LTE”

) or next generation (“

NextGen”

) 5G based network, with associated group identifiers (“

IDs”

); and

assign orthogonal codes within a first UE group of the plurality of UE groups to eliminate signal interference among first UEs of the first UE group, wherein the first UEs share resources and scrambling codes based on a first group ID that identifies the first UEs from other UEs of the plurality of UE groups.

6. The apparatus of claim 1, wherein the one or more processors are further configured to:

decode the uplink transmissions received from the first UE while designating the uplink transmissions received from other UEs of the UEs as a noise; and

after decoding the uplink transmissions received from the first UE, decode the uplink transmissions received from a second UE of the UEs while treating the uplink transmissions received from the other UEs of the UEs and the first UE as the noise.

7. The apparatus of claim 1, wherein the one or more processors are further configured to:

generate an order of decoding based on received signal-to-interference-plus-noise ratios (“

SINRs”

) from the UEs, wherein the order of decoding is ordered from a greatest SINR to a lowest SINR corresponding to the UEs, respectively, and decode the uplink transmissions according to the order of decoding;

or

generate a maximum likelihood (“

ML”

) decoding of the the uplink transmissions from the UEs.

8. An apparatus configured to be employed in a user equipment (“

UE”

) comprising;

one or more processors configured to;

receive one or more downlink signals to schedule uplink transmissions, wherein the one or more downlink signals comprise a first plurality of physical resource blocks (“

PRBs”

) corresponding to a non-orthogonal multiple access (“

NOMA”

) zone and a second plurality of PRBs corresponding to an orthogonal multiple access (“

OMA”

) zone for an uplink transmission;

determine whether to generate the uplink transmission within the NOMA zone or the OMA zone based on at least one of;

a transmission packet size or a transmission rate;

perform a frequency hopping operation with a designated set of PRBs among the first plurality of PRBs by using a set of first allocated PRBs of the designated set of PRBs to generate the uplink transmission and afterwards using one or more second allocated resources of the designated set of PRBs that are different from the first allocated resources to generate another uplink transmission without an explicit grant message; and

a communication interface, coupled to the one or more processors, configured to receive or transmit communication transmissions.

9. The apparatus of claim 8, wherein the one or more processors are further configured to:

determine whether to generate the uplink transmission within the NOMA zone or the OMA zone, based on an OMA zone indication that is received or based on a determination that the transmission packet size or the transmission rate satisfies a threshold that is received via one or more system information blocks (“

SIBs”

).

10. The apparatus of claim 8, wherein the one or more processors are further configured to:

measure an energy level in the NOMA zone prior to transmission of the uplink transmission;

when the measured energy level is less than a predefined threshold, initiate the uplink transmission with any PRB within the NOMA zone; and

when the measured energy level is greater than the predefined threshold, measure the energy level of the NOMA zone after a backoff period as part of a listen before talk protocol.

11. The apparatus of claim 8, wherein the one or more processors are further configured to:

generate an orthogonal code to transmit on a same set of resources among a group of UEs with a same group identifier, wherein the same set of resources comprises a PRB of the first plurality of PRBs corresponding to the NOMA zone;

spread one or more quadrature amplitude modulation (“

QAM”

) symbols based on the orthogonal code across the first plurality of PRBs;

combine the spread QAM symbols;

perform a discrete fourier transformation (“

DFT”

) spreading operation on the combined QAM symbols to obtain DFT-spread symbols;

map the DFT-spread symbols across one or more PRBs of the first plurality of PRBs corresponding to the NOMA zone; and

perform an Inverse fast fourier transform (“

IFFT”

) spreading operation on the mapped DFT-symbols.

12. The apparatus of claim 8, wherein the one or more processors are further configured to:

spread data symbols among the first plurality of PRBs over the NOMA zone based on at least one of;

a rate matching or a repetition, of the data symbols.

13. The apparatus of claim 8, wherein the one or more processors are further configured to:

generate a contention based physical uplink shared channel operation based on a sharing of an assigned subset of the first plurality of PRBs that is assigned to other UEs with a same group identifier (“

ID”

), wherein the first plurality of PRBs of the NOMA zone comprise non-contiguous PRBs distributed over a transmission bandwidth.

14. The apparatus of claim 8, wherein the one or more processors are further configured to:

communicate a request to initiate communications in the OMA zone from the NOMA zone, wherein the request is based on a transmission of larger packets using larger resources than resources designated as being in the NOMA zone; and

after receiving an explicit grant message based on the request, transmit data with a PRB of the second plurality of PRBs corresponding to the OMA zone.

15. The apparatus of claim 14, wherein the one or more processors are further configured to communicate the request in a buffer status report (“

BSR”

) and use orthogonal codes to transmit on a same set of PRBs as other UEs identified in a same UE group corresponding to a same group ID that distinguishes the same UE group from other UE groups over a long term evolution (“

LTE”

) or next generation (“

NextGen”

) 5G network.

16. A non-transitory computer-readable medium storing executable instructions that, in response to execution, cause one or more processors of an evolved NodeB (“

eNB”

) to perform operations, comprising;

multiplexing a plurality of user equipments (“

UEs”

) in a downlink transmission that enables an uplink transmission by providing a first plurality of physical resource blocks (“

PRBs”

) as a non-orthogonal multiple access (“

NOMA”

) zone and a second plurality of PRBs as an orthogonal multiple access (“

OMA”

) zone;

scheduling a first UE of the plurality of UEs to generate the uplink transmission with the first plurality of PRBs within the NOMA zone based on a first transmission packet size or a first transmission rate satisfying a predefined threshold; and

receiving a request for an explicit grant message to change from using a first PRB of the NOMA zone to using a second PRB of the OMA zone for the uplink transmission, based on the transmission packet size or the transmission rate exceeding the predefined threshold, wherein the predefined threshold comprises a threshold related to an IoT standard.

17. The non-transitory computer-readable medium of claim 16, wherein the operations further comprise:

scheduling a second UE to generate a second transmission in the NOMA zone with a same PRB as the first UE, wherein the first UE and the second UE comprise a group identifier (“

ID”

) that distinguishes a group of UEs comprising the first UE and the second UE from another group of UEs comprising other UEs over a long term evolution (“

LTE”

) or next generation (“

NextGen”

) 5G based network; and

receiving uplink transmissions from the first UE and the second UE in the LTE or NextGen 5G network via a synchronous network connection with the same PRB based on different orthogonal codes that are substantially orthogonal to one another within the group of UEs.

18. The non-transitory computer-readable medium of claim 16, wherein the operations further comprise:

signaling the predefined threshold to the first UE via a radio resource control (“

RRC”

) signaling, wherein the predefined threshold comprises an Internet of Things (“

IoT”

) threshold associated with an IoT standard for the first transmission packet size or the first transmission rate.

19. The non-transitory computer-readable medium of claim 16, wherein the operations further comprise:

decoding the uplink transmission received from the first UE while designating uplink transmissions received from other UEs of the plurality of UEs as a noise; and

after decoding the uplink transmission received from the first UE, decoding the uplink transmissions received from a second UE of the other UEs while treating the uplink transmissions received from the other UEs and the first UE as the noise.

20. The non-transitory computer-readable medium of claim 16, wherein the operations further comprise:

generating an order of decoding based on received signal-to-interference-plus-noise ratios (“

SINRs”

) from the of the plurality of UEs, wherein the order of decoding is ordered from a greatest SINR to a lowest SINR corresponding to the of the plurality of UEs, respectively, and decoding the uplink transmissions according to the order of decoding.

21. The non-transitory computer-readable medium of claim 16, wherein the operations further comprise:

generating a maximum likelihood (ML) decoding of the the uplink transmissions from the plurality of UEs.