METHOD AND APPARATUS FOR FAST CLOSED-LOOP RATE ADAPTATION IN A HIGH RATE PACKET DATA TRANSMISSION
First Claim
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1. A method for increasing the data throughput rate of a communication network, comprising the steps of:
- generating a plurality of data slots and a plurality of gap slots at an access point, wherein the plurality of data slots are interleaved with the plurality of gap slots to form a plurality of packets;
transmitting the plurality of packets to an access terminal; and
detecting the plurality of packets at the access terminal, wherein the access terminal transmits at least one indicator message to the access point indicating a reception status.
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Abstract
In a high data rate communication system capable of variable rate transmission, an open loop rate control can be adjusted with a closed loop rate control to maximize throughput. An access point generates interleaved multi-slot packets that allow an access terminal to transmit indicator messages to the access point in accordance with recently received data carried within slots of the multi-slot packets.
30 Citations
23 Claims
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1. A method for increasing the data throughput rate of a communication network, comprising the steps of:
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generating a plurality of data slots and a plurality of gap slots at an access point, wherein the plurality of data slots are interleaved with the plurality of gap slots to form a plurality of packets;
transmitting the plurality of packets to an access terminal; and
detecting the plurality of packets at the access terminal, wherein the access terminal transmits at least one indicator message to the access point indicating a reception status. - View Dependent Claims (2, 3, 4)
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5. A method for increasing the data throughput rate for transmissions from an access point to an access terminal, comprising the steps of:
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generating a plurality of data packets at the access point for transmission to the access terminal, wherein each of the plurality of data packets comprises at least one slot, and the access point designates each slot in each of the plurality of data packets as a data slot or a gap slot;
transmitting the plurality of data packets to the access terminal at an initial data rate;
determining a set of estimated channel parameters at the access terminal;
transmitting a data request message to the access point based on the set of estimated channel parameters, wherein the step of transmitting the plurality of data packets to the access terminal is performed in accordance with the data request message;
determining a set of actual channel parameters at the access terminal;
transmitting an indicator message to the access point if the set of actual channel parameters passes a predetermined quality amount, wherein the step of transmitting is performed during a time period associated with at least one gap slot; and
modifying a subsequent data packet for transmission to the access terminal in accordance with the indicator message received at the access point. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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- 18. A system for increasing the data throughput rate of transmissions from an access point to an access terminal, comprising a processor at the access point configured to generate a plurality of interleaved data slots and gap slots for transmission to the access terminal.
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22. An apparatus for adjusting an open loop rate control process, comprising:
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a scheduler at an access point for scheduling a plurality of interleaved data slots and gap slots, wherein the schedule is coupled to at least one buffer that stores data to be transmitted on a forward link channel;
a data rate request message decoder coupled to the scheduler for decoding a plurality of data request messages received on a reverse link channel, and for inputting data rate request information to the scheduler; and
an indicator message decoder coupled to the scheduler for decoding the plurality of indicator messages received on the reverse link channel and for inputting decoded indicator messages to the scheduler.
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23. An apparatus for adjusting an open loop rate control process, comprising:
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an estimation element at the access terminal for determining a quality value associated with a forward link channel;
an open loop rate control element coupled to the estimation element for generating a plurality of data rate request messages, wherein the open loop rate control element uses the quality value received from the estimation element for the determining the contents of the plurality of data rate request messages;
a closed loop rate control element coupled to the estimation element and a decoder for generating a plurality of indicator messages based on either the quality value from the estimation element or an error value from the decoder, wherein the decoder is configured to decode a plurality of interleaved data slots and gap slots received on the forward link channel;
a controller coupled to the decoder and the estimation element for enabling the closed loop rate control element in accordance with a set of threshold values.
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Specification