GNU Radio's GSM Package
gsmtap.h
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1 #ifndef _GSMTAP_H
2 #define _GSMTAP_H
3 
4 /* gsmtap header, pseudo-header in front of the actua GSM payload */
5 
6 /* GSMTAP is a generic header format for GSM protocol captures,
7  * it uses the IANA-assigned UDP port number 4729 and carries
8  * payload in various formats of GSM interfaces such as Um MAC
9  * blocks or Um bursts.
10  *
11  * Example programs generating GSMTAP data are airprobe
12  * (http://airprobe.org/) or OsmocomBB (http://bb.osmocom.org/)
13  */
14 
15 #include <stdint.h>
16 
17 #define GSMTAP_VERSION 0x02
18 
19 #define GSMTAP_TYPE_UM 0x01 /* A Layer 2 MAC block (23 bytes) */
20 #define GSMTAP_TYPE_ABIS 0x02
21 #define GSMTAP_TYPE_UM_BURST 0x03 /* raw burst bits */
22 
23 #define GSMTAP_BURST_UNKNOWN 0x00
24 #define GSMTAP_BURST_FCCH 0x01
25 #define GSMTAP_BURST_PARTIAL_SCH 0x02
26 #define GSMTAP_BURST_SCH 0x03
27 #define GSMTAP_BURST_CTS_SCH 0x04
28 #define GSMTAP_BURST_COMPACT_SCH 0x05
29 #define GSMTAP_BURST_NORMAL 0x06
30 #define GSMTAP_BURST_DUMMY 0x07
31 #define GSMTAP_BURST_ACCESS 0x08
32 #define GSMTAP_BURST_NONE 0x09
33 
34 #define GSMTAP_CHANNEL_UNKNOWN 0x00
35 #define GSMTAP_CHANNEL_BCCH 0x01
36 #define GSMTAP_CHANNEL_CCCH 0x02
37 #define GSMTAP_CHANNEL_RACH 0x03
38 #define GSMTAP_CHANNEL_AGCH 0x04
39 #define GSMTAP_CHANNEL_PCH 0x05
40 #define GSMTAP_CHANNEL_SDCCH 0x06
41 #define GSMTAP_CHANNEL_SDCCH4 0x07
42 #define GSMTAP_CHANNEL_SDCCH8 0x08
43 #define GSMTAP_CHANNEL_TCH_F 0x09
44 #define GSMTAP_CHANNEL_TCH_H 0x0a
45 #define GSMTAP_CHANNEL_ACCH 0x80
46 
47 #define GSMTAP_ARFCN_F_PCS 0x8000
48 #define GSMTAP_ARFCN_F_UPLINK 0x4000
49 #define GSMTAP_ARFCN_MASK 0x3fff
50 
51 #define GSMTAP_UDP_PORT 4729 /* officially registered with IANA */
52 
53 #if (defined(_WIN16) || defined(_WIN32) || defined(_WIN64)) && !defined(__WINDOWS__)
54 # define __WINDOWS__
55 #endif
56 
57 #ifdef __WINDOWS__
58 #define PACKED( class_to_pack ) __pragma( pack(push, 1) ) class_to_pack __pragma( pack(pop) )
59 #else
60 #define PACKED( class_to_pack ) class_to_pack __attribute__((__packed__))
61 #endif
63 struct gsmtap_hdr {
64  uint8_t version; /* version, set to GSMTAP_VERSION */
65  uint8_t hdr_len; /* length in number of 32bit words */
66  uint8_t type; /* see GSMTAP_TYPE_* */
67  uint8_t timeslot; /* timeslot (0..7 on Um) */
68 
69  uint16_t arfcn; /* ARFCN (frequency) */
70  int8_t signal_dbm; /* signal level in dBm */
71  int8_t snr_db; /* signal/noise ratio in dB */
72 
73  uint32_t frame_number; /* GSM Frame Number (FN) */
74 
75  uint8_t sub_type; /* Type of burst/channel, see above */
76  uint8_t antenna_nr; /* Antenna Number */
77  uint8_t sub_slot; /* sub-slot within timeslot */
78  uint8_t res; /* reserved for future use (RFU) */
79 
80 }
81 );
82 
83 #endif /* _GSMTAP_H */
gr::gsm::version
GRGSM_API const std::string version()
return version string defined by cmake (GrVersion.cmake)
PACKED
#define PACKED(class_to_pack)
Definition: gsmtap.h:60
type
uint8_t type
Definition: gsm_04_08.h:0