Base station device, terminal device, communication method and communication system

Patent metadata

Field	Value
Publication number	US-12445903-B2
Application number	US-202519055880-A
Country	US
Kind code	B2
Filing date	Feb 18, 2025
Priority date	Apr 3, 2018
Publication date	Oct 14, 2025
Grant date	Oct 14, 2025

Abstract

A base station device including: a transmitter configured to transmit, for each logical channel, first data of a first type and second data of a second type; and processor circuitry configured to: omit information about a data length of the second data in a MAC protocol data unit (PDU), place a medium access control (MAC) header in front of a MAC service data unit (MSDU) of the second data, and multiplex the first data and the second data, wherein the data length of the second data is omitted from the MAC header and an R bit (reserved bit) is set in the first bit of the first octet in the MAC header.

First claim

The invention claimed is:

1. A transmitting device comprising:
a transmitter configured to transmit first data of a first type for a first logical channel, and to transmit second data of a second type for a second logical channel; and
processor circuitry configured to:
place, in a medium access control (MAC) layer, a first MAC header in front of a MAC service data unit (MSDU) including the second data, the second data being transferred to the MAC layer from a layer that is higher than the MAC layer, the first MAC header including a Reserve field (R-field) and a Logical Channel Identifier (LCID) field, the LCID field of the first MAC header which is placed in front of the MSDU being set to a first index which is selected from a plurality of indices, the first index indicating a first LCID value, the first LCID value being used for the second data in the MSDU, and
multiplex the first data and the second data, wherein information about a data length of the MSDU is omitted from the first MAC header and a Reserve bit (R bit) is set at bit one in a first octet in the first MAC header, the data length of the MSDU being fixed, and

wherein the processor circuitry is further configured to select the first MAC header from a plurality of MAC headers, the plurality of MAC headers including:
the first MAC header that includes the first octet, the R-field being located at the bit one of the first octet, and another R-field being located at bit two of the first octet, the LCID field being located from bit three to bit eight of the first octet, and
a second MAC header that includes:
a first octet which includes an R-field and an LCID field; and
a second octet which includes a Length field (L-field).

2. The transmitting device of claim 1 , wherein
the first MAC header consists of the first octet.

3. The transmitting device of claim 1 , wherein
the first LCID value that is used for the second data in the MSDU is used for identifying the second logical channel for the second data.

4. The transmitting device of claim 3 , wherein
the plurality of indices includes:
the first index; and
a second index indicating a second LCID value, wherein the second LCID value is used for the first data of the first type and is used for identifying the first logical channel for the first data.

5. The transmitting device of claim 4 , wherein
the plurality of indices includes a third index indicating a padding.

6. A receiving device comprising:
a receiver configured to receive first data of a first type for a first logical channel, and to receive second data of a second type for a second logical channel; and
processor circuitry configured to process data according to a first medium access control (MAC) header placed in front of a MAC service data unit (MSDU) including the second data, the second data being transferred to the MAC layer from a layer that is higher than the MAC layer, the first MAC header including a Reserve field (R-field) and a Logical Channel Identifier (LCID) field, the LCID field of the first MAC header which is placed in front of the MSDU being set to a first index which is selected from a plurality of indices, the first index indicating a first LCID value, the first LCID value being used for the second data in the MSDU,
wherein the first data and the second data are multiplexed, and wherein information about a data length of the MSDU is omitted from the first MAC header and a Reserve bit (R bit) is set at bit one in a first octet in the first MAC header, the data length of the MSDU being fixed,
wherein the first MAC header is selected from a plurality of MAC headers, the plurality of MAC headers including:
the first MAC header that includes the first octet, the R-field being located at the bit one of the first octet, and another R-field being located at bit two of the first octet, the LCID field being located from bit three to bit eight of the first octet, and
a second MAC header that includes:
a first octet which includes an R-field and an LCID field; and
a second octet which includes a Length field (L-field).

7. A transmitting method comprising:
placing, in a medium access control (MAC) layer, a first MAC header in front of a MAC service data unit (MSDU) including second data, the second data being transferred to the MAC layer from a layer that is higher than the MAC layer, the first MAC header including a Reserve field (R-field) and a Logical Channel Identifier (LCID) field, the LCID field of the first MAC header which is placed in front of the MSDU being set to a first index which is selected from a plurality of indices, the first index indicating a first LCID value, the first LCID value being used for the second data in the MSDU;
multiplexing first data of a first type and the second data of a second type, wherein information about a data length of the MSDU is omitted from the first MAC header and a Reserve bit (R bit) is set at bit one in a first octet in the first MAC header, the data length of the MSDU being fixed; and
transmitting the first data and the second data which are multiplexed,
wherein the method further comprises selecting the first MAC header from a plurality of MAC headers, the plurality of MAC headers including:
the first MAC header that includes the first octet, the R-field being located at the bit one of the first octet, and another R-field being located at bit two of the first octet, the LCID field being located from bit three to bit eight of the first octet, and
a second MAC header that includes:
a first octet which includes an R-field and an LCID field; and
a second octet which includes a Length field (L-field).

Assignees

• Fujitsu Ltd

Inventors

• Ohta Yoshiaki
• Ode Takayoshi
• Kawasaki Yoshihiro

Classifications

• H04W80/02

  Data link layer protocols · CPC title

• H04W88/08 Primary

  Access point devices · CPC title

• H04L1/0018

  based on latency requirement · CPC title

• H04W24/02

  Arrangements for optimising operational condition · CPC title

• H04W28/06 Primary

  Optimizing {the usage of the radio link}, e.g. header compression, information sizing {, discarding information (system modifying transmission characteristic according to link quality by modifying frame length H04L1/0007; dynamic adaptation of the packet size for flow control or congestion control H04L47/365)} · CPC title