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US 6,807,154 B1Granted
Link and radio cell adaptation in TDD systems
AssigneeTelefonaktiebolaget LM Ericsson
InventorsGöran Malmgren, Jamshid Khun-Jush, Hui Li, Uwe Dettmar, Peter Schramm, Jörn Thielecke, Udo Wachsmann
Life of this patent
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Abstract
A TDMA/TDD link adaptation method determines radio link quality at a base station. The radio link quality is used to update and broadcast a physical layer parameter indicator (10-16) from the base station on a broadcast control channel having a common physical layer parameter indicator for all uplink and downlink channels.
Claims16
A TDMA/TDD media access control frame structure encoded in a computer-readable medium, said control frame structure comprising:
- a broadcast message having a common dynamically updated physical layer parameter indicator for a plurality of uplink channels, said common dynamically updated physical layer parameter indicator for indicating a decision relating to a chosen transmission/reception mode for performing radio cell adaptation on said associated uplink channels;
- wherein an indicator change forces a change of transmission/reception mode to said chosen transmission/reception mode for all of said plurality of uplink channels;
- an announcement and assignment message having an individual dynamically updated physical layer parameter indicator for a particular downlink channel, said individual dynamically updated physical layer parameter indicator for indicating a decision relating to a chosen transmission/reception mode for performing individual link adaptation for a particular mobile station associated with said particular downlink channel;
- and
- wherein said broadcast message indicates a proper physical layer parameter that is to be used by a receiver to decode said individual dynamically updated physical layer parameter indicator included in the announcement and assignment message.
2 more elements
A TDMA/TDD link adaptation method, including
- determining radio link quality at a central controller;
- updating and broadcasting a broadcast message including a common physical layer parameter indicator for a plurality of channels from said central controller, said common physical layer parameter indicator for indicating a decision relating to said determined link quality for performing radio cell adaptation on an associated plurality of uplink channels;
- wherein said common physical layer parameter indicator adapts transmission/reception mode for all of said plurality of uplink channels to said determined link quality;
- updating and transmitting an announcement and assignment message including an individual physical layer parameter indicator for a particular downlink channel, said individual physical layer parameter indicator for indicating a decision relating to a determined link quality for performing individual link adaptation for a particular mobile station associated with said downlink channel;
- and
- wherein said broadcast message indicates a proper physical layer parameter that is to be used by a receiver to decode said individual physical layer parameter indicator included in the announcement and assignment message.
3 more elements
A TDMA/TDD radio communications system utilizing a TDMA/TDD media access control frame structure, said system comprising:
- a central controller for transmitting a broadcast message having a common dynamically updated physical layer parameter indicator for a plurality of uplink channels, said common dynamically updated physical layer parameter indicator for indicating a decision relating to a chosen transmission/reception mode for performing radio cell adaptation on said associated uplink channels, whereby an indicator change forces a change of transmission/reception mode for all of said plurality of channels to said chosen transmission/reception mode;
- wherein said central controller further handles an announcement and assignment message having an individual dynamically updated physical layer parameter indicator for a particular downlink channel, said individual dynamically updated physical layer parameter indicator for indicating a decision relating to a chosen transmission/reception mode for performing individual link adaptation for a particular mobile station associated with said particular downlink channel;
- and
- wherein said broadcast message indicates a proper physical layer parameter that is to be used by a receiver to decode said individual dynamically updated physical layer parameter indicator included in the announcement and assignment message.
1 more element
Dependencies are inferred from the claim text.