Base station apparatus and radio transmission method

• US 6,909,881 B2
• Filed: 01/18/2002
• Issued: 06/21/2005
• Est. Priority Date: 01/19/2001
• Status: Expired due to Term

• Current Assignee: III Holdings 12, LLC (Intellectual Ventures LLC)
• Original Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Inventors: Hiramatsu, Katsuhiko, Miyoshi, Kenichi, Hoshino, Masayuki, Miya, Kazuyuki, Uehara, Toshiyuki
• Primary Examiner(s): Nguyen, Lee
• Application Number:
  US10/204,221
• Publication Number:
  US 20030096635A1
• Time in Patent Office: 1,250 Days
• Field of Search: 455/69.1, 455/522, 455/450, 455/451, 455/452, 455/512, 455/513, 370/335, 370/342
• US Class Current: 455/69
• CPC Class Codes: H04L 1/0009 by adapting the channel coding H04L1/1812 takes precedence
• CPC Class Codes: H04L 1/0015 characterised by the adaptation strategy
• CPC Class Codes: H04L 1/0032 Without explicit signalling
• CPC Class Codes: H04L 1/0034 where the transmitter decides based on inferences, e.g. use of implicit signalling
• CPC Class Codes: H04W 28/14 using intermediate storage
• CPC Class Codes: H04W 52/24 using SIR [Signal to Interference Ratio] or other wireless path parameters
• CPC Class Codes: H04W 52/40 during macro-diversity or soft handoff
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal
• CPC Class Codes: H04W 72/542 using measured or perceived quality
• CPC Class Codes: H04W 84/04 Large scale networks; Deep hierarchical networks

Abstract

A base station transmits downlink signals to mobile terminals of users A to C with respective transmission power corresponding to downlink quality. A downlink quality estimating section (106) uses the transmission power from a transmission power control section to compare transmission power between the users, and estimates that a terminal with low transmission power has high downlink quality. The priorities are determined so that the priority is increased as the transmission power is lower. Thus determined priority information is output to a scheduling section (107). The scheduling section (107) performs scheduling based on the priority information. The section (107) assigns DSCH to terminals in ascending order of transmission power. User A is first assigned DSCH, user B is second assigned DSCH, and user C is third assigned DSCH. It is thus possible to perform scheduling and MCS selection of DSCH with the need of information from a terminal eliminated.

Claims

1. A base station apparatus comprising:

a selection section that selects a coding rate and a modulation scheme of a DSCH (downlink shared channel) based on transmission power of a downlink DPCH (dedicated physical channel) associated with the DSCH.

2. The base station apparatus according to claim 1, further comprising:

a coding section that codes a signal using the coding rate selected by said selection section; and

a modulation section that modulates the signal using the modulation scheme selected by said selection section.

3. The base station apparatus according to claim 2, further comprising:

a transmission section that transmits the signal coded by said coding section and modulated by said modulation section DSCH.

4. The base station apparatus according to claim 1,

wherein the DSCH is shared by a plurality of communication terminals and the downlink DPCH is for each of the plurality of communication terminals.

5. A communication system comprising:

a base station; and

a communication terminal,

wherein the base station selects a coding rate and a modulation scheme of a DSCH (downlink shared channel) based on transmission power of a downlink DPCH (dedicated physical channel) associated with the DSCH, and

wherein the communication terminal receives a signal, which is coded using the coding rate selected by the base station and modulated using the modulation scheme selected by the base station, on the DSCH.

6. A radio transmission method in a base station, comprising:

selecting a coding rate and a modulation scheme of a DSCH (downlink shared channel) based on transmission power of a downlink DPCH (dedicated physical channel) associated with the downlink DSCH.