Uplink Contention Based Multiple Access for Cellular IoT

Patent metadata

Field	Value
Publication number	US-2016255654-A1
Application number	US-201615054108-A
Country	US
Kind code	A1
Filing date	Feb 25, 2016
Priority date	Feb 26, 2015
Publication date	Sep 1, 2016
Grant date	—

Abstract

Methods and apparatus are provided contention based uplink data transmission. In one novel aspect, the contention-based uplink data channel is used to transmit the data directly to the network. In one embodiment, the UE selects an UL data channel from a set of preconfigured uplink contention based data channels and sends the UL data transmission on the selected UL data channel. In one embodiment, the contention based UL data has a narrow bandwidth with a long CP such that the TA is not needed from the base station. In another embodiment, a small signaling payload is included in the CB UL data transmission if the size of the data contents cannot be fit in the UL data channel. In one embodiment, the signaling payload is the BSR. The UE, subsequently, receives an UL grant and sends the remaining data contents using the allocated data channel in the UL grant.

First claim

What is claimed is:

1 . A method, comprising:
selecting an uplink (UL) contention-based (CB) data channel by a user equipment (UE) in a wireless network, wherein the UL data channel is selected from a set of preconfigured UL CB data channels; generating an UL data transmission, wherein the UL data transmission includes at least an identification (ID) of the UE and UL data contents; sending the UL data transmission on the selected UL CB data channel to a base station; and receiving a response for the UL data transmission from the base station.

2 . The method of claim 1 , wherein the UL CB data channel has a narrow bandwidth with a long cyclic prefix (CP) such that a timing advance (TA) from the base station is avoided.

3 . The method of claim 1 , wherein the set of preconfigured UL contention data channels is configured by a radio resource control (RRC) message or a broadcast system information message.

4 . The method of claim 1 , wherein the response from the base station is an ACK/NACK indicating a reception status of the UL data transmission.

5 . The method of claim 1 , further comprising:
detecting a size of the UL data contents being larger than a UL data channel capacity, wherein the UL data channel capacity is a maximum data size the UL CB data channel can include; and generating the data transmission to further include an indicator for UL grant request, wherein the data transmission includes part of the UL data contents.

6 . The method of claim 5 , wherein, the UL grant request is a buffer status report (BSR).

7 . The method of claim 5 , wherein the response from the base station is an UL grant, wherein the UL grant includes dedicated UL data channel for transmitting remaining UL data contents.

8 . The method of claim 1 , further comprising:
obtaining a set of demodulation reference signal (DMRS) seeds; selecting a transmission DMRS seed from the set of DMRS seeds; generating a DMRS using the selected transmission DMRS seed; and sending the data transmission using the generated DMRS on the selected UL contention data channel.

9 . The method of claim 8 , wherein the obtaining the set of DMRS seeds comprising:
receiving a cell-specific parameter from the wireless network in a SIB2; and generating the set of DMRS seeds based on a pre-defined rule and the received cell-specific parameter.

10 . The method of claim 8 , wherein the obtaining the set of DMRS seeds involves: receiving the set of DMRS seeds from a broadcast system information message.

11 . A user equipment (UE), comprising:
a radio frequency (RF) transceiver that transmits and receives radio signals in a wireless network; a channel selector that selects an uplink (UL) contention-based (CB) data channel, wherein the UL data channel is selected from a set of preconfigured UL CB data channels; a transmission generator that generates an UL data transmission, wherein the UL data transmission includes at least an identification (ID) of the UE and UL data contents; a CB sender that sends the UL data transmission on the selected UL CB data channel to a base station; and a response receiver that receives a response for the UL data transmission from the base station.

12 . The UE of claim 11 , wherein the UL CB data channel has a narrow bandwidth with a long cyclic prefix (CP) such that a timing advance (TA) from the base station is avoided.

13 . The UE of claim 11 , wherein the set of preconfigured UL contention data channels is configured by a radio resource control (RRC) message or a broadcast system information message.

14 . The UE of claim 11 , wherein the response from the base station is an ACK/NACK indicating a reception status of the UL data transmission.

15 . The UE of claim 11 , wherein the transmission generator detects a size of the UL data contents being larger than a UL data channel capacity, wherein the UL data channel capacity is a maximum data size the UL CB data channel can include, and generates the data transmission to further include an indicator for UL grant request, wherein the data transmission includes part of the UL data contents.

16 . The UE of claim 15 , wherein, the UL grant request is a buffer status report (BSR).

17 . The UE of claim 15 , wherein the response from the base station is an UL grant, wherein the UL grant includes dedicated UL data channel for transmitting remaining UL data contents.

18 . The UE of claim 11 , further comprising: a demodulation reference signal (DMRS) generator that obtains a set of DMRS seeds, selects a transmission DMRS seed from the set of DMRS seeds, generates a DMRS using the selected transmission DMRS seed, and sends the data transmission using the generated DMRS on the selected UL contention data channel.

19 . The UE of claim 18 , wherein the obtaining the set of DMRS seeds comprising:
receiving a cell-specific parameter from the wireless network in a SIB2; and generating the set of DMRS seeds based on a pre-defined rule and the received cell-specific parameter.

20 . The UE of claim 18 , wherein the obtaining the set of DMRS seeds involves: receiving the set of DMRS seeds from a broadcast system information message.

Assignees

• Mediatek Inc

Inventors

• Lin Shiang-Jiun
• Charbit Gilles
• Fu I-Kang

Classifications

• H04L1/00

  Arrangements for detecting or preventing errors in the information received {(correcting synchronisation H04L7/00)} · CPC title

• H04L5/0048

  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

• H04W72/02

  Selection of wireless resources by user or terminal · CPC title

• H04L1/1867

  Arrangements specially adapted for the transmitter end · CPC title

• H04L5/0055

  Physical resource allocation for ACK/NACK (for physical mapping arrangements in ARQ protocols H04L1/1861) · CPC title