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

[Xavier Arteaga]

Hi John,
I see your point. We will revise the usages of these macros.

Many thanks,
Xavier


On Tue, 15 Oct 2019 at 10:59, john wu <john.wu.8899 at hotmail.com> wrote:

> 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
> 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> 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
> provide SDR PA LNA duplexer
>
> Best Regards
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>
>
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