[srslte-users] what is the mean of TX_DELAY and FDD_HARQ_DELAY_MS

[john wu]

Hi Xavier,
so there are many place the source code misuse TX_DELAY and FDD_HARQ_DELAY_MS but just because TX_DELAY is equal to FDD_HARQ_DELAY_MS then there is no problem.
for example:
uint32_t pending_tti              = (current_tti + MSG3_DELAY_MS + TX_DELAY) % 10;
this case TX_DELAY should be FDD_HARQ_DELAY_MS.

#define TTI_RX_ACK(tti) ((tti + (2 * FDD_HARQ_DELAY_MS)) % 10240)
this case one FDD_HARQ_DELAY_MS should be TX_DELAY



www.zhixun-wireless.top<http://www.zhixun-wireless.top/>
provide SDR PA LNA duplexer

Best Regards

________________________________
From: Xavier Arteaga <xavier at softwareradiosystems.com>
Sent: Monday, October 14, 2019 16:50
To: john wu <john.wu.8899 at hotmail.com>
Cc: srslte-users at lists.softwareradiosystems.com <srslte-users at lists.softwareradiosystems.com>
Subject: Re: [srslte-users] what is the mean of TX_DELAY and FDD_HARQ_DELAY_MS

Hi John,
That is correct!

Xavier

On Mon, 14 Oct 2019 at 10:35, john wu <john.wu.8899 at hotmail.com<mailto:john.wu.8899 at hotmail.com>> wrote:
#define TX_DELAY 4
#define MSG3_DELAY_MS 2 // Delay added to TX_DELAY
#define TTI_SUB(a, b) ((((a) + 10240) - (b)) % 10240)
#define TTI_TX(tti) ((tti + TX_DELAY) % 10240)// Use only in FDD mode!!
#define FDD_HARQ_DELAY_MS 4
#define TTI_RX(tti) (TTI_SUB(tti, FDD_HARQ_DELAY_MS))
#define TTI_RX_ACK(tti) ((tti + (2 * FDD_HARQ_DELAY_MS)) % 10240)

the definition is above. i want to know what TX_DELAY and FDD_HARQ_DELAY_MS means. FDD_HARQ_DELAY_MS is easier to understand it is the ack time delay from TX to ack. but TX_DELAY seems the time advance to transmit the data to the radio hardware, it that correct.



www.zhixun-wireless.top<http://www.zhixun-wireless.top/>
provide SDR PA LNA duplexer

Best Regards

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