Cell Change Based on Uplink Configuration

Patent metadata

Field	Value
Publication number	US-2016353343-A1
Application number	US-201515117404-A
Country	US
Kind code	A1
Filing date	Feb 11, 2015
Priority date	Feb 11, 2014
Publication date	Dec 1, 2016
Grant date	—

Abstract

The presently disclosed techniques and apparatus include techniques by which a cell change for a UE is based on the target cell's uplink transmission configuration, including, for example, the maximum number of allowed UL physical channel (e.g., UL resource blocks) for the target cell. An example method, such as might be performed in a network node, comprises determining ( 1010 ) an uplink transmission configuration related to uplink physical channels that can be transmitted by the wireless device on the second cell on the second frequency, and comparing ( 1020 ) a parameter of the determined uplink transmission configuration with a threshold or with a corresponding parameter of a determined uplink transmission configuration related to uplink physical channels that can be transmitted by the wireless device on the first cell on the first frequency. This example method further comprises performing ( 1030 ) a cell change to the second cell, based on the comparison.

First claim

1 - 42 . (canceled)

43 . A method, in a network node, of performing cell change of a wireless device from a first cell on a first frequency to a second cell on a second frequency, the method comprising:
determining an uplink transmission configuration related to uplink physical channels that can be transmitted by the wireless device on the second cell on the second frequency; comparing a parameter of the determined uplink transmission configuration with a threshold or with a corresponding parameter of a determined uplink transmission configuration related to uplink physical channels that can be transmitted by the wireless device on the first cell on the first frequency; and performing a cell change to the second cell based on the comparison.

44 . The method of claim 43 , wherein the uplink transmission configurations for the first and second cells include maximum uplink transmission block sizes for the wireless device on the first and second cells, respectively, and/or maximum numbers of uplink resource blocks for the wireless device on the first and second cells, respectively.

45 . The method of claim 43 , wherein the cell change to the second cell is performed in response to said comparison meeting at least one of the following conditions:
a number of uplink physical channels that can be transmitted by the wireless device on the second cell is above the threshold; a ratio of a number of uplink physical channels that can be transmitted by the wireless device on the second cell and a total number of uplink physical channels over the transmission bandwidth of the second cell is above the threshold; a difference, in the frequency domain, between the locations of at least one uplink physical channel that can be transmitted by the wireless device in the second cell and a last or first uplink physical channel in the second cell is above the threshold; a maximum power reduction for the wireless device in the second cell is below the threshold; and a spurious emission requirement level for the wireless device in the second cell is below the threshold; and an Additional Maximum Power Reduction for the wireless device in the second cell is below the threshold.

46 . The method of claim 43 , wherein said comparing comprises comparing a parameter related to the determined uplink transmission configuration on the second cell on the second frequency with a corresponding parameter related to a determined uplink transmission configuration on the first cell.

47 . The method of claim 46 , wherein the cell change to the second cell is performed in response to the difference between the parameter related to the determined uplink transmission configuration on the second cell with the corresponding parameter related to the determined uplink transmission configuration on the first cell being below the threshold.

48 . The method of claim 47 , wherein the cell change to the second cell is performed in response to at least one of the following conditions being met:
a difference between the numbers of uplink physical channels that can be transmitted by the wireless device on the first and second cells is below a threshold; a difference between the ratio of the number of uplink physical channels that can be transmitted by the wireless device on the second cell to the total number of uplink physical channels over the transmission bandwidth of the second cell and the ratio of the number of uplink physical channels that can be transmitted by the wireless device on the first cell to the total number of uplink physical channels over the transmission bandwidth of the first cell is above threshold; a difference between: the difference in frequency between the locations of at least one uplink physical channel that can be transmitted and a last or first uplink physical channel for the first cell, and the difference in frequency between the locations of at least one uplink physical channel that can be transmitted and a last or first uplink physical channel for the second cell, is above a threshold; a difference between maximum power reductions on the first and second cells is below a threshold; and a difference between additional spurious emission requirement levels or additional maximum power reductions for the wireless device on the first and the second cells is above a threshold.

49 . The method of claim 43 , wherein the uplink physical channels are uplink resource blocks, uplink physical resource blocks, or uplink virtual resource blocks.

50 . The method of claim 43 , wherein the cell change to the second cell is performed further in response to determining that the uplink transmission configuration for the second cell enables the wireless device to meet pre-defined downlink receiver sensitivity requirements.

51 . The method of claim 43 , wherein the first cell is a primary cell and the second cell is a secondary cell in an uplink carrier aggregation for the wireless device.

52 . The method of claim 43 , wherein the second cell and the second frequency are any of:
a secondary cell in an uplink carrier aggregation for the wireless device and a secondary frequency, respectively; an inter-frequency cell and an inter-frequency carrier, respectively; or an inter-radio-access-technology cell and an inter-radio-access-technology carrier, respectively.

53 . The method of claim 43 , wherein the uplink transmission configuration for the second cell is pre-defined or received from another node.

54 . The method of claim 43 , wherein said determining the uplink transmission configuration, comparing the parameter, and performing the cell change are triggered by:
determining a current or expected uplink transmission parameter for the wireless device; determining a required uplink configuration, based on the current or expected uplink transmission parameter; and comparing the required uplink configuration to a current uplink configuration for the first cell.

55 . The method of claim 54 , wherein the current or expected uplink transmission parameter for the wireless device is one of:
an uplink transmission rate based on a measured average uplink rate over a time period; an uplink transmission rate based on previous uplink transmissions; a buffer size or expected data rate reported to the network node by the wireless device; and an uplink transmission rate estimated from a downlink data rate.

56 . A method, in a wireless device connected to or served by a network node, of performing cell change from a first cell on a first frequency to a second cell on a second frequency, the method comprising:
determining an uplink transmission configuration related to uplink physical channels that can be transmitted by the wireless device on the second cell on the second frequency; comparing a parameter of the determined uplink transmission configuration with a threshold or with a corresponding parameter of a determined uplink transmission configuration related to uplink physical channels that can be transmitted by the wireless device on the first cell on the first frequency; and performing a cell change to the second cell based on the comparison.

57 . The method of claim 56 , wherein the parameter comprises at least one of:
maximum uplink transmission block sizes for the wireless device on the first and second cells, respectively, a maximum number of uplink resource blocks for the wireless device on the first and second cells, respectively a number of uplink physical channels that can be transmitted on the first and second cells, respectively; a relation between a number of uplink physical channels that can be

Assignees

• ERICSSON TELEFON AB L M (publ)

Inventors

• Rahman Imadur
• Kazmi Muhammad

Classifications

• H04W36/32

  by location or mobility data, e.g. speed data · CPC title

• H04W36/245

  Electricity · mapped topic

• H04W36/30

  by measured or perceived connection quality data · CPC title

• H04W36/08 Primary

  Reselecting an access point · CPC title

• H04W36/302

  due to low signal strength · CPC title