| 摘要 |
In the GPRS EDGE system Fast Ack/Nack Reports (FANR) are proposed wherein acknowledgment data is piggy backed with user data. In the scheme multiple RLC/MAC higher layer data blocks may be included in each lower layer radio block, typically one or two. Where two RLC/MAC blocks are included the standard acknowledgment will be two bits with a 1 indicating a successful reception of each RLC/MAC respectively. The invention has analysed the typical reception probabilities within the system and proposed variable length acknowledgement codes. Suggested coding is 0 successful receipt (<B>E</B>), 10 both blocks failed (<B>A or B</B>), 110 only block 2 failed (<B>C</B>), 111 only block 1 failed (<B>D</B>). For typical reception statistics this scheme will only require less than the standard 2 bits per radio block. Each ARQ response may apply to multiple radio blocks and the encoding is applied to each radio block individually. The acknowledgements may be sent in separately as well as in block combined with data. |
