Cooperating timer and retransmission counter for buffer management in a HARQ wireless network
First Claim
1. A method comprising:
- (a) using a wait transmission counter (WAIT_TX_CNT) to determine whether a retransmission of a Hybrid Automatic Repeat ReQuest (HARQ) sub-burst has not been received within a Predetermined Retransmission Delay (PRD) interval after receipt of a last transmission of the HARQ sub-burst;
(b) incrementing a retransmission counter (RE_TX_CNT) in response to a determination in (a) that a retransmission of the HARQ sub-burst has not been received within a PRD interval, and incrementing the RE_TX_CNT in response to receiving an undecodable retransmission of the HARQ sub-burst onto the mobile station; and
(c) flushing a soft combining buffer if the RE_TX_CNT reaches a maximal retransmission count (MAX_RE_CNT), wherein the WAIT_TX_CNT, the RE_TX_CNT, and the soft combining buffer are maintained on a mobile station, and wherein steps (a) thru (c) occur on the mobile station; and
wherein the PRD interval in (a) is an interval of time starting at the receipt by the mobile station of the last transmission of the HARQ sub-burst.
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Accused Products
Abstract
In a Hybrid Automatic Repeat ReQuest (HARQ) communication system, a receiver receives from a transmitter a HARQ sub-burst. A retransmission counter (RE_TX_CNT) in the receiver is incremented if either: (i) the receiver cannot decode the sub-burst, or (ii) no retransmission of the sub-burst is received within a Predetermined Retransmission Delay (PRD) interval. If RE_TX_CNT reaches a Maximal Retransmission Count (MAX_RE_CNT), then information for the sub-burst that was previously stored for HARQ purposes in a soft combining buffer in the receiver is flushed. Parameters that set the PRD interval and the MAX_RE_CNT value are pre-negotiated between the transmitter and the receiver. In another embodiment, if a novel timer in the receiver indicates that a first threshold time has elapsed after receipt of an undecodable HARQ transmission then buffered information is marked, whereas if the timer indicates that a second threshold time has elapsed then the marked information is flushed.
19 Citations
11 Claims
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1. A method comprising:
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(a) using a wait transmission counter (WAIT_TX_CNT) to determine whether a retransmission of a Hybrid Automatic Repeat ReQuest (HARQ) sub-burst has not been received within a Predetermined Retransmission Delay (PRD) interval after receipt of a last transmission of the HARQ sub-burst; (b) incrementing a retransmission counter (RE_TX_CNT) in response to a determination in (a) that a retransmission of the HARQ sub-burst has not been received within a PRD interval, and incrementing the RE_TX_CNT in response to receiving an undecodable retransmission of the HARQ sub-burst onto the mobile station; and (c) flushing a soft combining buffer if the RE_TX_CNT reaches a maximal retransmission count (MAX_RE_CNT), wherein the WAIT_TX_CNT, the RE_TX_CNT, and the soft combining buffer are maintained on a mobile station, and wherein steps (a) thru (c) occur on the mobile station; and
wherein the PRD interval in (a) is an interval of time starting at the receipt by the mobile station of the last transmission of the HARQ sub-burst. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification