Method of transmitting data based on adaptive modulation and coding

• US 8,553,525 B2
• Filed: 11/06/2008
• Issued: 10/08/2013
• Est. Priority Date: 11/07/2007
• Status: Expired due to Fees

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Choi, Jin Soo, Nam, Seung Woo, Kim, Jong Min, Han, Jong Young, Cho, Han Gyu, Chung, Jae Hoon, Park, Hyung Ho
• Primary Examiner(s): Hsu, Alpus H
• Assistant Examiner(s): LAM, YEE F
• Application Number:
  US12/682,037
• Publication Number:
  US 20100208678A1
• Time in Patent Office: 1,797 Days
• Field of Search: 370/211, 370/329, 370/343, 375/260, 455/450
• US Class Current: 370/211
• CPC Class Codes: H04L 1/0025 Transmission of mode-switching indication
• CPC Class Codes: H04L 1/0029 Reduction of the amount of signalling, e.g. retention of useful signalling or differential signalling power control H04W52/04
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04L 5/0032 Distributed allocation, i.e. involving a plurality of allocating devices, each making partial allocation
• CPC Class Codes: H04L 5/0046 Determination of how many bits are transmitted on different sub-channels
• CPC Class Codes: H04L 5/006 Quality of the received signal, e.g. BER, SNR, water filling
• CPC Class Codes: H04L 5/0064 Rate requirement of the data, e.g. scalable bandwidth, data priority

Abstract

A method of transmitting data is provided. The method includes generating a frame, the frame comprising a data burst, a submap and a map wherein the submap indicates a resource allocation state of the data burst, and the map indicates a differential adaptive modulation and coding (AMC) level for the submap, and transmitting data using the frame, wherein the differential AMC level is information on change in an AMC level applied to the submap comparing with other submap in a different frame. High-speed data transmission is realized and limited radio resources can be more efficiently used.

Claims

1. A method of transmitting data, the method comprising:

grouping a plurality of mobile stations having a same channel state;

generating a frame, the frame comprising a preamble, a map, a submap and a data burst, wherein the submap indicates a resource allocation state of the data burst, and the map indicates an adaptive modulation and coding (AMC) level for the submap; and

transmitting data using the frame to the plurality of mobile stations;

wherein the AMC level for the submap is determined by a channel state of the plurality of mobile stations, and

wherein the submap is a region including control information for the plurality of mobile stations having the same channel state and the control information is encoded using the AMC level indicated by the map, and

wherein the map is transmitted through fixed radio resources in the frame, the fixed radio resources comprising an orthogonal frequency division multiplexing (OFDM) symbol contiguous to a first OFDM symbol where the preamble is transmitted, and

wherein the map comprises differential AMC level, the differential AMC level is information on change in the AMC level applied to the submap comparing with other submap in a previous frame, and wherein the differential AMC level comprises a value of the amount of change in the AMC level applied to the submap and AMC level up/down information that indicates whether the value is a positive or negative number.

2. The method of claim 1, wherein the differential AMC level is an amount of AMC level change that represents an amount of change in the AMC level applied to the submap.

3. The method of claim 1, wherein the frame comprises a plurality of submaps and the map indicates the differential AMC level for each of the plurality of submaps.

4. A method of transmitting an adaptive modulation and coding (AMC) level in an AMC scheme-based communication system, the method comprising:

grouping a plurality of mobile stations having a same channel state;

transmitting a first frame to the plurality of mobile stations in a first transmission period, the first frame comprising a first data burst, a first submap and a first map wherein the first submap indicates a resource allocation state of the first data burst, and the first map indicates an AMC level for the first submap; and

transmitting a second frame to the plurality of mobile stations in a second transmission period, the second frame comprising a second data burst, a second submap and a second map wherein the second submap indicates a resource allocation state of the second data burst, and the second map indicates an AMC level for the second submap,

wherein the AMC level for the first submap and the AMC level for the second submap are determined by channel states of the plurality of mobile stations, and

wherein the first submap and the second submap are regions including control information for the plurality of mobile stations having the same channel state, and

wherein the first map and the second map are transmitted through fixed radio resources in corresponding frames, the radio resources comprising an orthogonal frequency division multiplexing (OFDM) symbol contiguous to a first OFDM symbol where a preamble is transmitted,

wherein the first map indicates the AMC level for the first submap with a full AMC level that represents any selected one of all AMC levels

and the second map indicates the AMC level for the second submap with a differential AMC level that represents an amount of change in the AMC level for the second submap comparing with the AMC level for the first submap,

and the differential AMC level comprises a value of the amount of change in the AMC level for the second submap and AMC level up/down information that indicates whether the value is a positive or negative number.