Pseudo randomization of unused resources at a medium access control (MAC) layer

Patent metadata

Field	Value
Publication number	US-10044478-B2
Application number	US-201514795718-A
Country	US
Kind code	B2
Filing date	Jul 9, 2015
Priority date	Jul 14, 2014
Publication date	Aug 7, 2018
Grant date	Aug 7, 2018

Abstract

The present disclosure relates to pseudo-randomization of unused resources at a medium access control layer (MAC) of a user equipment (UE). For example, the disclosure presents a method and an apparatus for determining that an uplink (UL) resource grant, associated with a first radio access technology (RAT), for the UE results in unused resources where there are a greater number of resources than available data for transmission at the UE, wherein the UE is configured to receive information associated with a second RAT, and wherein the first RAT is different from the second RAT, populating the unused resources, at a medium access control (MAC) layer, with pseudo-randomized bits, and transmitting at least a portion of the available data and the populated unused resources using the UL resource grant associated with the first RAT. As such, pseudo-randomization of unused resources at a medium access control layer (MAC) of a UE may be achieved.

First claim

What is claimed is:

1. A method for wireless communications, by a user equipment (UE), comprising:
determining that an uplink (UL) resource grant, associated with a first radio access technology (RAT), for the UE results in unused resources where there are a greater number of resources than available data for transmission at the UE, wherein the UE is configured to receive information associated with a second RAT, and wherein the first RAT is different from the second RAT;
populating the unused resources, at a medium access control (MAC) layer, with pseudo-randomized bits by:
generating a maximum length sequence (MLS) and storing the MLS in a first buffer at the MAC layer,
performing a bit inversion of the MLS and storing an output of the bit inversion in a second buffer at the MAC layer,
initiating a linear feedback shift register (LFSR) with a non-zero value at the MAC layer, and
copying contents of the first buffer to a MAC transmit buffer when a value of a least significant bit (LSB) of the LFSR is zero and contents of the second buffer to the MAC transmit buffer when the value of the LSB of the LFSR is one to produce sequences of pseudorandom bits within the MAC transmit buffer; and

transmitting at least a portion of the available data and the unused resources populated with the contents of the MAC transmit buffer using the UL resource grant associated with the first RAT.

2. The method of claim 1 , further comprising:
updating a state of the LFSR by right shifting contents of the LFSR by one or more bits.

3. The method of claim 1 , further comprising:
copying contents of the second buffer to the MAC transmit buffer when the value of the LSB of the LFSR is one.

4. The method of claim 3 , wherein the populating further comprises:
updating a state of the LFSR by right shifting contents of the LFSR by one or more bits; and
performing an exclusive OR (XOR) operation on an output of the updating using connection taps, wherein the connection taps are bit positions in the LFSR.

5. The method of claim 1 , wherein the first RAT is long term evolution (LTE) RAT and the second RAT is associated with a global navigation satellite system (GNSS) RAT.

6. The method of claim 5 , wherein the first RAT is operating in LTE band number 13 and the second RAT is operating in GNSS L1 band.

7. An apparatus for wireless communications, by a user equipment (UE), comprising:
means for determining that an uplink (UL) resource grant, associated with a first radio access technology (RAT), for the UE results in unused resources where there are a greater number of resources than available data for transmission at the UE, wherein the UE is configured to receive information associated with a second RAT, and wherein the first RAT is different from the second RAT;
means for populating the unused resources, at a medium access control (MAC) layer, with pseudo-randomized bits including:
means for generating a maximum length sequence (MLS) and storing the MLS in a first buffer at the MAC layer,
means for performing a bit inversion of the MLS and storing an output of the bit inversion in a second buffer at the MAC layer,
means for initiating a linear feedback shift register (LFSR) with a non-zero value at the MAC layer, and
means for copying contents of the first buffer to a MAC transmit buffer when a value of a least significant bit (LSB) of the LFSR is zero and contents of the second buffer to the MAC transmit buffer when the value of the LSB of the LFSR is one to produce sequences of pseudorandom bits within the MAC transmit buffer; and

means for transmitting at least a portion of the available data and the unused resources populated with the contents of the MAC transmit buffer using the UL resource grant associated with the first RAT.

8. The apparatus of claim 7 , further comprising:
means for updating a state of the LFSR by right shifting contents of the LFSR by one or more bits.

9. The apparatus of claim 7 , further comprising:
means for copying contents of the second buffer to the MAC transmit buffer when the value of the LSB of the LFSR is one.

10. The apparatus of claim 9 , wherein the means for populating further comprises:
means for updating a state of the LFSR by right shifting contents of the LFSR by one or more bits; and
means for performing an exclusive OR (XOR) operation on an output of the updating using connection taps, wherein the connection taps are bit positions in the LFSR.

11. The apparatus of claim 7 , wherein the first RAT is long term evolution (LTE) RAT and the second RAT is associated with a global navigation satellite system (GNSS) RAT.

12. The apparatus of claim 11 , wherein the first RAT is operating in LTE band number 13 and the second RAT is operating in GNSS L1 band.

13. A non-transitory computer-readable medium storing code executable by a processor for wireless communications at a user equipment (UE), comprising:
code for determining that an uplink (UL) resource grant, associated with a first radio access technology (RAT), for the UE results in unused resources where there are a greater number of resources than available data for transmission at the UE, wherein the UE is configured to receive information associated with a second RAT, and wherein the first RAT is different from the second RAT;
code for populating the unused resources, at a medium access control (MAC) layer, with pseudo-randomized bits including:
code for generating a maximum length sequence (MLS) and storing the MLS in a first buffer at the MAC layer,
code for performing a bit inversion of the MLS and storing an output of the bit inversion in a second buffer at the MAC layer,
code for initiating a linear feedback shift register (LFSR) with a non-zero value at the MAC layer, and
copying contents of the first buffer to a MAC transmit buffer when a value of a least significant bit (LSB) of the LFSR is zero and contents of the second buffer to the MAC transmit buffer when the value of the LSB of the LFSR is one to produce sequences of pseudorandom bits within the MAC transmit buffer; and

code for transmitting at least a portion of the available data and the unused resources populated with the contents of the MAC transmit buffer using the UL resource grant associated with the first RAT.

14. The computer-readable medium of claim 13 , further comprising:
code for updating a state of the LFSR by right shifting contents of the LFSR by one or more bits.

15. The computer-readable medium of claim 13 , further comprising:
code for copying contents of the second buffer to the MAC transmit buffer when the value of the LSB of the LFSR is one.

16. The computer-readable medium of claim 15 , wherein the code for populating further comprises:
code for updating a state of the LFSR by right shifting contents of the LFSR by one or more bits; and

code for performing an exclusive OR (XOR) operation on an output of the updating using connection taps, wherein the connection taps are bit positions in the LFSR.

17. The computer-readable medium of claim 13 , wherein the first RAT is long term evolution (LTE) RAT and the second RAT is associated with a global navigation satellite system (GNSS) RAT.

18. The computer-readable medium of claim 17 , wherein the first RAT is operating in LTE band number 13 and the second RAT is operating in GNSS L1 band.

19. A user equipment for wireless communications, comprising:
a memory; and
at least one processor coupled to the memory and configured to:
determine that an uplink (UL) resource grant, associated wi

Assignees

• Qualcomm Inc

Inventors

• Jain Amit Gopilal
• Simic Emilija Milorad
• Nguyen Bao Vinh
• Farmer Dominic Gerard
• Ehsan Arif
• Subramani Dinesh
• Hoang Duong Anh
• Pals Timothy Paul

Classifications

• H04W72/00

  Local resource management · CPC title

• H04L27/34

  Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems · CPC title

• H04L5/0048 Primary

  Allocation of pilot signals, i.e. of signals known to the receiver (allocation of control signalling H04L5/0053; use of control signalling H04L5/0091) · CPC title

• G06F7/584

  using finite field arithmetic, e.g. using a linear feedback shift register · CPC title

• H04B7/00

  Radio transmission systems, i.e. using radiation field (H04B10/00, H04B15/00 take precedence) · CPC title