mirror of
https://github.com/oliverschmidt/contiki.git
synced 2024-12-22 10:30:13 +00:00
A quick, initial implementation of the LPP power-saving MAC protocol (Musaloiu-E et al, IPSN 2008)
This commit is contained in:
adamdunkels
parent
6709823d4a
commit
dbab9fbdb5
@ -1 +1 @@
|
||||
CONTIKI_SOURCEFILES += xmac.c nullmac.c
|
||||
CONTIKI_SOURCEFILES += xmac.c nullmac.c lpp.c #xmac2.c
|
||||
|
||||
316
core/net/mac/lpp.c
Normal file
316
core/net/mac/lpp.c
Normal file
@ -0,0 +1,316 @@
|
||||
/*
|
||||
* Copyright (c) 2008, Swedish Institute of Computer Science.
|
||||
* All rights reserved.
|
||||
*
|
||||
* Redistribution and use in source and binary forms, with or without
|
||||
* modification, are permitted provided that the following conditions
|
||||
* are met:
|
||||
* 1. Redistributions of source code must retain the above copyright
|
||||
* notice, this list of conditions and the following disclaimer.
|
||||
* 2. Redistributions in binary form must reproduce the above copyright
|
||||
* notice, this list of conditions and the following disclaimer in the
|
||||
* documentation and/or other materials provided with the distribution.
|
||||
* 3. Neither the name of the Institute nor the names of its contributors
|
||||
* may be used to endorse or promote products derived from this software
|
||||
* without specific prior written permission.
|
||||
*
|
||||
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
|
||||
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
||||
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
||||
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
|
||||
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
||||
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
||||
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
||||
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
||||
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
||||
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
||||
* SUCH DAMAGE.
|
||||
*
|
||||
* This file is part of the Contiki operating system.
|
||||
*
|
||||
* $Id: lpp.c,v 1.1 2008/05/15 08:56:29 adamdunkels Exp $
|
||||
*/
|
||||
|
||||
/**
|
||||
* \file
|
||||
* Low power probing (R. Musaloiu-Elefteri, C. Liang,
|
||||
* A. Terzis. Koala: Ultra-Low Power Data Retrieval in
|
||||
* Wireless Sensor Networks, IPSN 2008)
|
||||
*
|
||||
* \author
|
||||
* Adam Dunkels <adam@sics.se>
|
||||
*
|
||||
*
|
||||
* This is an implementation of the LPP (Low-Power Probing) MAC
|
||||
* protocol. LPP is a power-saving MAC protocol that works by sending
|
||||
* a probe packet each time the radio is turned on. If another node
|
||||
* wants to transmit a packet, it can do so after hearing the
|
||||
* probe. To send a packet, the sending node turns on its radio to
|
||||
* listen for probe packets.
|
||||
*
|
||||
*/
|
||||
|
||||
#include "dev/leds.h"
|
||||
|
||||
#include "net/rime.h"
|
||||
#include "net/mac/mac.h"
|
||||
#include "net/mac/lpp.h"
|
||||
#include "net/rime/rimebuf.h"
|
||||
|
||||
#define DEBUG 0
|
||||
#if DEBUG
|
||||
#include <stdio.h>
|
||||
#define PRINTF(...) printf(__VA_ARGS__)
|
||||
#else
|
||||
#define PRINTF(...)
|
||||
#endif
|
||||
|
||||
|
||||
#define TYPE_PROBE 1
|
||||
#define TYPE_DATA 2
|
||||
struct lpp_hdr {
|
||||
uint16_t type;
|
||||
rimeaddr_t sender;
|
||||
rimeaddr_t receiver;
|
||||
};
|
||||
|
||||
static const struct radio_driver *radio;
|
||||
static void (* receiver_callback)(const struct mac_driver *);
|
||||
static struct pt pt;
|
||||
static struct ctimer timer;
|
||||
|
||||
static struct queuebuf *queued_packet;
|
||||
|
||||
#define LISTEN_TIME CLOCK_SECOND / 128
|
||||
#define OFF_TIME CLOCK_SECOND / 2
|
||||
|
||||
#define DUMP_QUEUED_PACKET 1
|
||||
|
||||
/*---------------------------------------------------------------------------*/
|
||||
static void
|
||||
turn_radio_on(void)
|
||||
{
|
||||
radio->on();
|
||||
leds_on(LEDS_YELLOW);
|
||||
}
|
||||
/*---------------------------------------------------------------------------*/
|
||||
static void
|
||||
turn_radio_off(void)
|
||||
{
|
||||
radio->off();
|
||||
leds_off(LEDS_YELLOW);
|
||||
}
|
||||
/*---------------------------------------------------------------------------*/
|
||||
/**
|
||||
* Send a probe packet.
|
||||
*/
|
||||
static void
|
||||
send_probe(void)
|
||||
{
|
||||
struct lpp_hdr *hdr;
|
||||
|
||||
rimebuf_clear();
|
||||
hdr = rimebuf_dataptr();
|
||||
rimebuf_set_datalen(sizeof(struct lpp_hdr));
|
||||
|
||||
rimeaddr_copy(&hdr->sender, &rimeaddr_node_addr);
|
||||
rimeaddr_copy(&hdr->receiver, rimebuf_addr(RIMEBUF_ADDR_RECEIVER));
|
||||
hdr->type = TYPE_PROBE;
|
||||
PRINTF("Sending probe\n");
|
||||
radio->send(rimebuf_hdrptr(), rimebuf_totlen());
|
||||
}
|
||||
/*---------------------------------------------------------------------------*/
|
||||
/**
|
||||
* Duty cycle the radio. The protothread is driven by a ctimer that is
|
||||
* initiated in the lpp_init() function.
|
||||
*/
|
||||
static int
|
||||
dutycycle(void *ptr)
|
||||
{
|
||||
struct ctimer *t = ptr;
|
||||
|
||||
PT_BEGIN(&pt);
|
||||
|
||||
while(1) {
|
||||
if(queued_packet != NULL) {
|
||||
|
||||
/* We are currently sending a packet so we should keep the radio
|
||||
turned on and not send any probes at this point. */
|
||||
ctimer_set(t, OFF_TIME * 2, dutycycle, t);
|
||||
PT_YIELD(&pt);
|
||||
queuebuf_free(queued_packet);
|
||||
queued_packet = NULL;
|
||||
PRINTF("Removing old packet\n");
|
||||
}
|
||||
turn_radio_on();
|
||||
send_probe();
|
||||
ctimer_set(t, LISTEN_TIME, dutycycle, t);
|
||||
PT_YIELD(&pt);
|
||||
turn_radio_off();
|
||||
|
||||
/* There is a bit of randomness here right now to avoid collisions
|
||||
due to synchronization effects. Not sure how needed it is
|
||||
though. XXX */
|
||||
ctimer_set(t, OFF_TIME / 2 + (random_rand() % OFF_TIME / 2), dutycycle, t);
|
||||
PT_YIELD(&pt);
|
||||
}
|
||||
|
||||
PT_END(&pt);
|
||||
}
|
||||
/*---------------------------------------------------------------------------*/
|
||||
/**
|
||||
*
|
||||
* Send a packet. This function builds a complete packet with an LPP
|
||||
* header and queues the packet. When a probe is heard (in the
|
||||
* read_packet() function), and the sender of the probe matches the
|
||||
* receiver of the queued packet, the queued packet is sent.
|
||||
*
|
||||
* ACK packets are treated differently from other packets: if a node
|
||||
* sends a packet that it expects to be ACKed, the sending node keeps
|
||||
* its radio on for some time after sending its packet. So we do not
|
||||
* need to wait for a probe packet: we just transmit the ACK packet
|
||||
* immediately.
|
||||
*
|
||||
*/
|
||||
static int
|
||||
send_packet(void)
|
||||
{
|
||||
struct lpp_hdr *hdr;
|
||||
|
||||
rimebuf_hdralloc(sizeof(struct lpp_hdr));
|
||||
hdr = rimebuf_hdrptr();
|
||||
|
||||
rimeaddr_copy(&hdr->sender, &rimeaddr_node_addr);
|
||||
rimeaddr_copy(&hdr->receiver, rimebuf_addr(RIMEBUF_ADDR_RECEIVER));
|
||||
hdr->type = TYPE_DATA;
|
||||
|
||||
rimebuf_compact();
|
||||
PRINTF("queueing packet type %d\n", hdr->type);
|
||||
|
||||
if(rimebuf_attr_isset(RIMEBUF_ATTR_PACKET_TYPE) &&
|
||||
rimebuf_attr(RIMEBUF_ATTR_PACKET_TYPE) == RIMEBUF_ATTR_PACKET_TYPE_ACK) {
|
||||
/* Immediately send ACKs - we're assuming that the other node is
|
||||
listening. */
|
||||
/* printf("Immediately sending ACK\n");*/
|
||||
return radio->send(rimebuf_hdrptr(), rimebuf_totlen());
|
||||
} else {
|
||||
|
||||
/* If a packet is already queued, the DUMP_QUEUED_PACKET option
|
||||
determines if the queued packet should be replaced with the new
|
||||
packet, or if the new packet should be dropped. XXX haven't
|
||||
measured the effect of this option */
|
||||
#if DUMP_QUEUED_PACKET
|
||||
if(queued_packet != NULL) {
|
||||
queuebuf_free(queued_packet);
|
||||
}
|
||||
queued_packet = queuebuf_new_from_rimebuf();
|
||||
#else /* DUMP_QUEUED_PACKET */
|
||||
if(queued_packet == NULL) {
|
||||
queued_packet = queuebuf_new_from_rimebuf();
|
||||
}
|
||||
#endif /* DUMP_QUEUED_PACKET */
|
||||
|
||||
/* Wait for a probe packet from a neighbor */
|
||||
turn_radio_on();
|
||||
}
|
||||
return 1;
|
||||
}
|
||||
/*---------------------------------------------------------------------------*/
|
||||
/**
|
||||
* Read a packet from the underlying radio driver. If the incoming
|
||||
* packet is a probe packet and the sender of the probe matches the
|
||||
* destination address of the queued packet (if any), the queued packet
|
||||
* is sent.
|
||||
*/
|
||||
static int
|
||||
read_packet(void)
|
||||
{
|
||||
int len;
|
||||
struct lpp_hdr *hdr, *qhdr;
|
||||
|
||||
rimebuf_clear();
|
||||
len = radio->read(rimebuf_dataptr(), RIMEBUF_SIZE);
|
||||
if(len > 0) {
|
||||
rimebuf_set_datalen(len);
|
||||
hdr = rimebuf_dataptr();
|
||||
rimebuf_hdrreduce(sizeof(struct lpp_hdr));
|
||||
PRINTF("got packet type %d\n", hdr->type);
|
||||
if(hdr->type == TYPE_PROBE) {
|
||||
if(queued_packet != NULL) {
|
||||
qhdr = queuebuf_dataptr(queued_packet);
|
||||
if(rimeaddr_cmp(&qhdr->receiver, &hdr->sender) ||
|
||||
rimeaddr_cmp(&qhdr->receiver, &rimeaddr_null)) {
|
||||
PRINTF("%d.%d: got a probe from %d.%d\n",
|
||||
rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1],
|
||||
hdr->sender.u8[0], hdr->sender.u8[1]);
|
||||
|
||||
radio->send(queuebuf_dataptr(queued_packet),
|
||||
queuebuf_datalen(queued_packet));
|
||||
queuebuf_free(queued_packet);
|
||||
queued_packet = NULL;
|
||||
|
||||
turn_radio_on(); /* XXX Awaiting an ACK: we should check the
|
||||
packet type of the queued packet to see
|
||||
if it is a data packet. If not, we
|
||||
should not turn the radio on. */
|
||||
}
|
||||
}
|
||||
} else if(hdr->type == TYPE_DATA) {
|
||||
PRINTF("%d.%d: got data from %d.%d\n",
|
||||
rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1],
|
||||
hdr->sender.u8[0], hdr->sender.u8[1]);
|
||||
}
|
||||
len = rimebuf_datalen();
|
||||
}
|
||||
return len;
|
||||
}
|
||||
/*---------------------------------------------------------------------------*/
|
||||
static void
|
||||
set_receive_function(void (* recv)(const struct mac_driver *))
|
||||
{
|
||||
receiver_callback = recv;
|
||||
}
|
||||
/*---------------------------------------------------------------------------*/
|
||||
static int
|
||||
on(void)
|
||||
{
|
||||
turn_radio_on();
|
||||
return 1;
|
||||
}
|
||||
/*---------------------------------------------------------------------------*/
|
||||
static int
|
||||
off(int keep_radio_on)
|
||||
{
|
||||
if(keep_radio_on) {
|
||||
turn_radio_on();
|
||||
} else {
|
||||
turn_radio_off();
|
||||
}
|
||||
return 1;
|
||||
}
|
||||
/*---------------------------------------------------------------------------*/
|
||||
static const struct mac_driver lpp_driver = {
|
||||
send_packet,
|
||||
read_packet,
|
||||
set_receive_function,
|
||||
on,
|
||||
off,
|
||||
};
|
||||
/*---------------------------------------------------------------------------*/
|
||||
static void
|
||||
input_packet(const struct radio_driver *d)
|
||||
{
|
||||
if(receiver_callback) {
|
||||
receiver_callback(&lpp_driver);
|
||||
}
|
||||
}
|
||||
/*---------------------------------------------------------------------------*/
|
||||
const struct mac_driver *
|
||||
lpp_init(const struct radio_driver *d)
|
||||
{
|
||||
radio = d;
|
||||
radio->set_receive_function(input_packet);
|
||||
ctimer_set(&timer, LISTEN_TIME, dutycycle, &timer);
|
||||
return &lpp_driver;
|
||||
}
|
||||
/*---------------------------------------------------------------------------*/
|
||||
52
core/net/mac/lpp.h
Normal file
52
core/net/mac/lpp.h
Normal file
@ -0,0 +1,52 @@
|
||||
/*
|
||||
* Copyright (c) 2008, Swedish Institute of Computer Science.
|
||||
* All rights reserved.
|
||||
*
|
||||
* Redistribution and use in source and binary forms, with or without
|
||||
* modification, are permitted provided that the following conditions
|
||||
* are met:
|
||||
* 1. Redistributions of source code must retain the above copyright
|
||||
* notice, this list of conditions and the following disclaimer.
|
||||
* 2. Redistributions in binary form must reproduce the above copyright
|
||||
* notice, this list of conditions and the following disclaimer in the
|
||||
* documentation and/or other materials provided with the distribution.
|
||||
* 3. Neither the name of the Institute nor the names of its contributors
|
||||
* may be used to endorse or promote products derived from this software
|
||||
* without specific prior written permission.
|
||||
*
|
||||
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
|
||||
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
||||
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
||||
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
|
||||
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
||||
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
||||
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
||||
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
||||
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
||||
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
||||
* SUCH DAMAGE.
|
||||
*
|
||||
* This file is part of the Contiki operating system.
|
||||
*
|
||||
* $Id: lpp.h,v 1.1 2008/05/15 08:56:29 adamdunkels Exp $
|
||||
*/
|
||||
|
||||
/**
|
||||
* \file
|
||||
* Low power probing (R. Musaloiu-Elefteri, C. Liang,
|
||||
* A. Terzis. Koala: Ultra-Low Power Data Retrieval in
|
||||
* Wireless Sensor Networks, IPSN 2008)
|
||||
*
|
||||
* \author
|
||||
* Adam Dunkels <adam@sics.se>
|
||||
*/
|
||||
|
||||
#ifndef __LPP_H__
|
||||
#define __LPP_H__
|
||||
|
||||
#include "net/mac/mac.h"
|
||||
#include "dev/radio.h"
|
||||
|
||||
const struct mac_driver *lpp_init(const struct radio_driver *d);
|
||||
|
||||
#endif /* __LPP_H__ */
|
||||
Loading…
Reference in New Issue
Block a user