Methods and apparatus relating to buffer status reports in a wireless communication network

Patent metadata

Field	Value
Publication number	US-11317317-B2
Application number	US-201816078125-A
Country	US
Kind code	B2
Filing date	Jun 14, 2018
Priority date	Jun 16, 2017
Publication date	Apr 26, 2022
Grant date	Apr 26, 2022

Abstract

One aspect of the disclosure provides a method for a terminal device in a wireless communications network, wherein the terminal device is configurable with a plurality of logical channel groups. The method comprises generating buffer status information and transmitting a message to a network node operative in the wireless communications network. The message comprises a buffer status report comprising the buffer status information. The buffer status report comprises respective indications, for each of the plurality of logical channel groups, of the availability of data to transmit in the terminal device for the logical channel group. The buffer status report further comprises respective buffer size fields, for one or more of the logical channel groups for which data is available to transmit, indicating an amount of data which is available to transmit.

First claim

The invention claimed is:

1. A method in a terminal device configured for operation in a wireless communications network, the terminal device configurable with a plurality of logical channel groups, the method comprising:
generating a buffer status report, the buffer status report comprising:
a bitmap comprising a plurality of bit positions, each bit position corresponding to a respective one of the logical channel groups according to a defined mapping between the bit positions and the logical channel groups and the bit in each bit position being asserted or not asserted in dependence on whether the buffer status report includes a buffer size field for the corresponding logical channel group, each included buffer size field indicating an amount of uplink data available for transmission by the terminal device for the corresponding logical channel group; and

transmitting the buffer status report to a network node operative in the wireless communications network, wherein:
the defined mapping between the bit positions of the bitmap and the logical channel groups reflects an ordering of the logical channel groups,
the same ordering is used for included buffer size fields, and
the ordering corresponds to logical channel group priority values associated with each logical channel group.

2. A method in a network node operative in a wireless communications network, the method comprising:
receiving a buffer status report from a terminal device operative in the wireless communications network, the terminal device being configurable with a plurality of logical channel groups, the buffer status report comprising:
a bitmap comprising a plurality of bit positions, each bit position corresponding to a respective one of the logical channel groups according to a defined mapping between the bit positions and the logical channel groups and the bit in each bit position being asserted or not asserted in dependence on whether the buffer status report includes a buffer size field for the corresponding logical channel group, each included buffer size field indicating an amount of uplink data available for transmission by the terminal device for the corresponding logical channel group, wherein:

the defined mapping between the bit positions of the bitmap and the logical channel groups reflects an ordering of the logical channel groups,
the same ordering is used for included buffer size fields, and
the ordering corresponds to logical channel group priority values associated with each logical channel group.

3. A terminal device configured for operation in a wireless communications network, the terminal device configurable with a plurality of logical channel groups, and comprising processing circuitry and a non-transitory machine-readable medium storing instructions that, when executed by the processing circuitry, cause the terminal device to:
generate a buffer status report comprising:
a bitmap comprising a plurality of bit positions, each bit position corresponding to a respective one of the logical channel groups according to a defined mapping between the bit positions and the logical channel groups and the bit in each bit position being asserted or not asserted in dependence on whether the buffer status report includes a buffer size field for the corresponding logical channel group, each included buffer size field indicating an amount of uplink data available for transmission by the terminal device for the corresponding logical channel group; and

transmit the buffer status report to a network node operative in the wireless communications network, wherein:
the defined mapping between the bit positions of the bitmap and the logical channel groups reflects an ordering of the logical channel groups,
the same ordering is used for included buffer size fields, and
the ordering corresponds to logical channel group priority values associated with each logical channel group.

4. The terminal device according to claim 3 , wherein the ordering reflects logical channel priority values associated with logical channels belonging to the logical channel groups.

5. The terminal device according to claim 4 , wherein the ordering reflects an average logical channel priority value for each logical channel group or the highest logical channel priority value for each logical channel group.

6. The terminal device according to claim 3 , wherein the buffer status report omits a length indicator for indicating a length of the buffer status report, and wherein each included buffer size field is of a fixed length, such that an overall length of the buffer status report is calculable by the network node from the number of bits asserted in the bitmap.

7. The terminal device according to claim 6 , wherein the non-transitory machine-readable medium further stores instructions that, when executed by the processing circuitry, cause the terminal device to include a buffer size field in the buffer status report for each logical channel group for which the terminal device has uplink data available for transmission, subject to a limit on a maximum length of the buffer status report.

8. The terminal device according to claim 7 , wherein:
the maximum length is determined based on an amount of resources that have been granted to the terminal device for the transmission of the buffer status report; or
the maximum length is configured in the terminal device.

9. The terminal device according to claim 7 , wherein the non-transitory machine-readable medium further stores instructions that, when executed by the processing circuitry, cause the terminal device to:
responsive to a determination that including buffer size fields for every logical channel group for which the terminal device has uplink data available for transmission would cause the buffer status report to exceed the maximum length, include only as many of the buffer size fields as can be included in the buffer status report without exceeding the maximum length.

10. The terminal device according to claim 9 , further comprising deciding which buffer size fields to include in dependence on priorities associated with the logical channel groups for which the terminal device has uplink data available to transmit.

11. A network node configured to operate in a wireless communications network, the network node comprising processing circuitry and a non-transitory machine-readable medium storing instructions that, when executed by the processing circuitry, cause the network node to:
receive a buffer status report from a terminal device operative in the wireless communications network, the terminal device being configurable with a plurality of logical channel groups, the buffer status report comprising:
a bitmap comprising a plurality of bit positions, each bit position corresponding to a respective one of the logical channel groups according to a defined mapping between the bit positions and the logical channel groups and the bit in each bit position being asserted or not asserted in dependence on whether the buffer status report includes a buffer size field for the corresponding logical channel group, each included buffer size field indicating an amount of uplink data available for transmission by the terminal device for the corresponding logical channel group, wherein:

the defined mapping between the bit positions of the bitmap and the logical channel groups reflects an ordering of the logical channel groups,
the same ordering is used for included buffer size fields, and
the ordering corresponds to logical channel group priority values associated with each logical channel group.

12. The network node according to claim 11 , wherein the non-transitory machine-readable medium

Assignees

• Ericsson Telefon Ab L M

Inventors

• Bergquist Gunnar
• Hofström Björn
• Wittberg Mikael

Classifications

• H04W72/56

  based on priority criteria · CPC title

• H04W72/21 Primary

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

• H04W28/0278 Primary

  using buffer status reports (dynamic wireless traffic scheduling definition H04W72/12) · CPC title

• H04W72/0453

  Resources in frequency domain, e.g. a carrier in FDMA · CPC title

• H04W72/10

  Electricity · mapped topic