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US 8,619,638 B2Granted
Slow adaptation of modulation and coding for packet transmission
AssigneeBlackBerry Limited
InventorsZhijun Cai, James Earl Womack, Wei Wu
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Abstract
Systems and methods for performing MCS adaptation are provided. In some cases, the network performs MCS adaptation based on received NACKs. In other cases, the mobile station determines an MCS based on channel quality measurements, and feeds back the MCS adaptation decision to the network. In either case, NACK-only feedback may be implemented to reduce interference.
Claims17
A method comprising:
- transmitting packets to a receiver using an MCS (modulation and coding scheme);
- receiving a plurality of NACKs (negative acknowledgement) in respect of packets transmitted to the receiver;
- and
- determining an updated MCS (modulation and encoding scheme) used to transmit subsequent packets to the receiver as a function of the plurality of NACKs,
- wherein determining the updated MCS comprises counting a number of the plurality of NACKs received over a time period and wherein the time period is at least 400ms.
2 more elements
A method comprising:
- a receiver receiving packets over a wireless channel;
- the receiver making a channel quality measurement in respect of the wireless channel;
- the receiver making an MCS adaptation decision based on the channel quality measurement;
- and
- the receiver feeding back the MCS adaptation decision in a slow rate manner, wherein the feeding back is performed at least every 400 ms.
2 more elements
Dependencies are inferred from the claim text.