# US 10,873,930 B2 · Framing for an adaptive modulation communication system

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- Number: US 10,873,930 B2
- Document ID: US10873930B2
- Status: Granted
- Kind: B2
- Application number: 15/644,320
- Filed: 2017-07-07
- Published: 2017-10-26
- Granted: 2020-12-22
- Earliest claimed: 2000-11-15
- Assignees: Wi-LAN, Inc.
- Applicants: Wi-LAN Inc.
- Inventors: Kenneth L. Stanwood; Israel Jay Klein; George Lin; An Chen
- Web page: https://patentgrep.com/patent/US10873930B2

## CPC

- H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal
- H04B 7/15557: {Selecting relay station operation mode, e.g. between amplify and forward mode, decode and forward mode or FDD - and TDD mode}
- H04B 7/212: Time-division multiple access {[TDMA]}
- H04B 7/2615: {using hybrid frequency-time division multiple access [FDMA-TDMA]}
- H04B 7/2656: {for structure of frame, burst}
- H04B 7/2681: {Synchronisation of a mobile station with one base station}
- H04L 1/0003: {by switching between different modulation schemes}
- H04L 1/0009: {by adapting the channel coding (H04L1/1812 takes precedence)}
- H04L 5/16: Half-duplex systems; Simplex/duplex switching; Transmission of break signals {non-automatically inverting the direction of transmission}
- H04W 56/0085: {detecting a given structure in the signal}
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)
- H04B: TRANSMISSION
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)

## Abstract

A system and method for mapping a combined frequency division duplexing (FDD) Time Division Multiplexing (TDM)/Time Division Multiple Access (TDMA) downlink subframe for use with half-duplex and full-duplex terminals in a communication system. Embodiments of the downlink subframe vary Forward Error Correction (FEC) types for a given modulation scheme as well as support the implementation of a smart antenna at a base station in the communication system. Embodiments of the system are also used in a TDD communication system to support the implementation of smart antennae. A scheduling algorithm allows TDM and TDMA portions of a downlink to efficiently co-exist in the same downlink subframe and simultaneously support full and half-duplex terminals.

## Claims

### Claim 1

A method of communication between a base station and a plurality of cellular telephones, comprising:
grouping the plurality of cellular telephones into groups by the downlink (DL) physical (PHY) mode in which they will receive DL data;
encoding, at the base station, for cellular telephones scheduled to receive DL data in a DL frame and for cellular telephones scheduled to transmit data in an uplink (UL) frame using a PHY mode compatible with cellular telephones scheduled to receive DL data in a DL frame and for cellular telephones scheduled to transmit data in an uplink (UL) frame:
synchronization information,
information about DL transmission resources allocated to the cellular telephones scheduled to receive DL data in the DL frame, including what portion of the DL transmission resources allocated to the cellular telephones is allocated for each of the cellular telephones scheduled to receive DL data in the DL frame, a DL transmission resource being associated with a DL PHY mode,
information about UL transmission resources allocated to cellular telephones scheduled to transmit data in the UL frame, including what portion of the UL transmission resources allocated to the cellular telephones is allocated for each of the cellular telephones scheduled to transmit UL data in the UL frame, an UL transmission resource being associated with an UL PHY mode, wherein the UL transmission resources are allocated to the cellular telephones such that the UL transmission resources allocated to cellular telephones belonging to the same group are kept contiguous in time, and
encoding the DL data using the associated DL PHY mode in the DL frame;
transmitting, from the base station, the DL frame, the encoded synchronization information, the encoded information about DL transmission resources and the encoded information about UL transmission resources, to the plurality of cellular telephones; and
receiving, at the base station, from at least one cellular telephone, UL data in the UL transmission resource of the UL frame according to the UL PHY mode.

### Claim 2 (depends on 1)

A method as claimed in claim 1, wherein the base station is operable to update the UL PHY mode and the DL PHY mode based on data traffic requirements and physical layer requirements of the wireless communication system.

### Claim 3 (depends on 2)

A method as claimed in claim 2, wherein the physical layer requirements include one or more of interference minimization, propagation delays and round trip delays.

### Claim 4 (depends on 1)

A method as claimed in claim 1, wherein the DL PHY mode provides information about a DL modulation scheme and a DL coding scheme to be used by the cellular telephones scheduled to receive DL data in the DL frame for decoding the DL data.

### Claim 5 (depends on 1)

A method as claimed in claim 1, wherein the UL PHY mode provides information about an UL modulation scheme and an UL coding scheme to be used by the cellular telephones scheduled to transmit data in the UL frame for encoding the UL data.

### Claim 6

A wireless system comprising:
a base station comprising
a transmitter and
a receiver,
the base station enabled to,
group a plurality of cellular telephones into groups by the downlink (DL) physical (PHY) mode in which they will receive DL data,
encode, for cellular telephones scheduled to receive DL data in a DL frame and for cellular telephones scheduled to transmit data in an uplink (UL) frame:
synchronization information,
information about DL transmission resources allocated to the cellular telephones scheduled to receive DL data in the DL frame, including what portion of the DL transmission resources allocated to the cellular telephones is allocated for each of the cellular telephones scheduled to receive DL data in the DL frame, a DL transmission resource being associated with a DL PHY mode,
information about UL transmission resources allocated to cellular telephones scheduled to transmit data in the UL frame, including what portion of the UL transmission resources allocated to the cellular telephones is allocated for each of the cellular telephones scheduled to transmit UL data in the UL frame, an UL transmission resource being associated with an UL PHY mode, wherein the UL transmission resources are allocated to the cellular telephones such that the UL transmission resources allocated to cellular telephones belonging to the same group are kept contiguous in time, and
the DL data using the associated DL PHY mode in the DL frame including
packing and fragmenting variable length MAC messages based on the information about the DL transmission resource allocated to the cellular telephone in the DL frame and error encoding and
modulating the MAC messages based on the DL PHY mode provided by the information about the DL transmission resource allocated to the cellular telephone in the DL frame,
transmit the DL frame, the encoded synchronization information, the encoded information about DL transmission resources and the encoded information about UL transmission resources, to the plurality of cellular telephones, and
receive, from at least one cellular telephone, UL data in the UL transmission resource of the UL frame according to the UL PHY mode.

### Claim 7 (depends on 6)

A system as in claim 6, wherein the DL PHY mode is updated based on the quality of the downlink.

### Claim 8 (depends on 6)

A system as in claim 6, wherein the UL PHY mode is updated based on the quality of the uplink.

### Claim 9 (depends on 6)

A system as claimed in claim 6, wherein the DL PHY mode provides information about a DL modulation scheme and a DL coding scheme to be used by the cellular telephone for encoding the DL data.

### Claim 10 (depends on 6)

A system as claimed in claim 6, wherein the UL PHY mode provides information about an UL modulation scheme and an UL coding scheme to be used by the cellular telephone for encoding the UL data.