Optimized transmission of machine type communication data from a mobile device to a wireless network

Patent metadata

Field	Value
Publication number	US-9635652-B2
Application number	US-201314383497-A
Country	US
Kind code	B2
Filing date	Mar 5, 2013
Priority date	Mar 22, 2012
Publication date	Apr 25, 2017
Grant date	Apr 25, 2017

Abstract

A method of transmitting data from a UE to an eNB is provided. In response to a data transmission request from a MTC application, the UE chooses a preamble ID based on the data size and transmits a random access preamble message to the eNB. The eNB returns a random access response message to the UE. The random access response message identifies resource allocated in an uplink channel and includes one or more transmission power control parameters associated with the second uplink channel. After determining that the data size is less than or equal to the allocated resources in the second uplink channel, the UE transmits a scheduled transmission message to the eNB using the allocated resource in the second uplink channel at a transmission power level determined by the one or more transmission power control parameters.

First claim

I claim:

1. A method of transmitting data from a UE to an eNB, comprising:
at the UE:
generating a data transmission request, wherein the data transmission request identifies a transmission data size and data to be transmitted;
choosing a preamble ID for the request, wherein the preamble ID is at least in part dependent on the data size;
transmitting a random access preamble message to the eNB via a Physical Random Access Channel, wherein the random access preamble message includes the preamble ID;
receiving a random access response message from the eNB via a Physical Downlink Shared Channel, wherein the random access response message identifies resource allocated in a Physical Uplink Control Channel and the random access response message includes one or more transmission power control parameters associated with the Physical Uplink Control Channel; and
in accordance with a determination that the data size is less than or equal to the allocated resources in the Physical Uplink Control Channel, transmitting a scheduled transmission message including the data to be transmitted to the eNB using the allocated resource in the Physical Uplink Control Channel at a transmission power level determined by the one or more transmission power control parameters.

2. The method of claim 1 , wherein the eNB is configured to allocate a first format of resource in the Physical Uplink Control Channel when the preamble ID is within a first group of preamble IDs and allocate a second format of resource in the Physical Uplink Control Channel when the preamble ID is within a second group of preamble IDs.

3. The method of claim 1 , wherein the random access preamble message includes a random access preamble ID that corresponds to the transmission data size.

4. The method of claim 1 , wherein the data to be transmitted is Machine-Type Communications data.

5. The method of claim 1 , wherein the size of the data to be transmitted is less than a predefined value.

6. The method of claim 1 , wherein the random access response message identifies a resource and a corresponding format associated with the Physical Uplink Control Channel.

7. The method of claim 1 , wherein the one or more transmission power control parameters includes a pathloss compensation that indicates a difference between a downlink pathloss estimate at the UE and an actual uplink pathloss through the Physical Uplink Control Channel.

8. The method of claim 1 , wherein the random access response message includes an instruction that instructs the UE whether to report a number of sent random access preamble requests.

9. A mobile communications device for performing an enhanced random access procedure, comprising:
a wireless module for performing wireless transmissions and receptions to and from a base station of a wireless network; and
a controller module for:
receiving a data transmission request from a MTC application, the request including a data transmission size and data to be transmitted;
choosing a preamble ID for the data transmission request;
transmitting a random access preamble to the base station using a Physical Random Access Channel via the wireless module, wherein the random access preamble includes the chosen preamble ID;
receiving a random access response message from the base station via the wireless module, wherein the random access response message includes information about resource allocated for the data transmission request in a Physical Uplink Control Channel, and one or more transmission power control parameters;
determining a transmission power level based on the one or more transmission power control parameters;
transmitting a scheduled message including the data to be transmitted using the allocated resource in the Physical Uplink Control Channel at the determined transmission power level;
increasing the transmission power level in accordance with the one or more transmission power control parameters if the transmission of the scheduled message fails; and
repeating said transmitting and increasing steps until a successful transmission of the scheduled message or the transmission of the scheduled message has failed for at least a predefined number of times.

10. A method performed by an eNB for receiving MTC data from a UE, the method comprising:
at the eNB:
initializing MTC-specific transmission power control parameters and including the transmission power control parameters to in a system information block;
broadcasting the system information block to the UE within a cell associated with the eNB;
receiving a random access preamble message from the UE via a Physical Random Access Channel, wherein the random access preamble message includes a preamble ID chosen by the UE based on a size of the MTC data;
determining a Physical Uplink Control Channel in accordance with the preamble ID and allocating resource in the Physical Uplink Control Channel for the UE;
sending a random access response message to the UE via a Physical Downlink Shared Channel, wherein the random access response message identifies resource allocated in the Physical Uplink Control Channel; and
receiving a scheduled transmission message from the UE using the allocated resource in the Physical Uplink Control Channel at a transmission power level determined by the transmission power control parameters, the scheduled transmission message including at least a portion of the MTC data.

11. The method of claim 10 , wherein the eNB is configured to allocate a first format of resource in the Physical Uplink Control Channel when the preamble ID is within a first group of preamble IDs and allocate a second format of resource in the Physical Uplink Control Channel when the preamble ID is within a second group of preamble IDs.

12. The method of claim 10 , wherein the size of the MTC data is less than a predefined value.

13. The method of claim 10 , wherein the random access response message identifies a resource and a corresponding format associated with the Physical Uplink Control Channel.

14. The method of claim 10 , wherein the transmission power control parameters includes a pathloss compensation that indicates a difference between a downlink pathloss estimate at the UE and an actual uplink pathloss through the Physical Uplink Control Channel.

15. The method of claim 10 , wherein the random access response message includes an instruction that instructs the UE whether to report a number of sent random access preamble requests.

Assignees

• Zte Usa Inc

Inventors

• Wu Huaming

Classifications

• H04W72/21 Primary

  in the uplink direction of a wireless link, i.e. towards the network · CPC title

• H04W72/20

  Control channels or signalling for resource management · CPC title

• H04W52/247

  where the output power of a terminal is based on a path parameter sent by another terminal · CPC title

• H04W52/48

  during retransmission after error or non-acknowledgment · CPC title

• H04W52/50

  at the moment of starting communication in a multiple access environment · CPC title