5B.3.2 Burst Types

25.2213GPPPhysical channels and mapping of transport channels onto physical channels (TDD)Release 17TS

Four types of bursts are defined. All of them consist of two data symbol fields, a midamble and a guard period, the lengths of which are different for the individual burst types. Thus, the number of data symbols in a burst depends on the SF and the burst type, as depicted in table 8AA.

Table 8AA: Number of data symbols (N) for burst type 1, 2, 3 and 4

Spreading factor (SF)	Burst Type 1	Burst Type 2	Burst Type 3	Burst Type 4
1	3904	4416	3712	4224
2	1952	2208	1856	N/A
4	976	1104	928	N/A
8	488	552	464	N/A
16	244	276	232	N/A
32	122	138	116	132

The support of burst types 1, 2 and 3 is mandatory for UEs supporting transmit and receive functions. UEs supporting transmit and receive functions and also MBSFN operation must additionally support burst type 4. UEs with receive only capability need only support burst type 4.. The three different bursts defined here are well suited for different applications, as described in the following sections.

5B.3.2.1 Burst Type 1

Burst type 1 can be used for uplink and downlink. Due to its longer midamble field this burst type supports the construction of a larger number of training sequences. The maximum number of training sequences depends on the cell configuration. For burst type 1 this number may be 4, 8, or 16.

The data fields of burst type 1 are 1952 chips long. The corresponding number of symbols depends on the spreading factor, as indicated in table 8AA above. The midamble of burst type 1 has a length of 1024 chips. The guard period for the burst type 1 is 192 chip periods long. Burst type 1 is shown in Figure 18AC. The contents of the burst fields are described in table 8AB.

Table 8AB: The contents of burst type 1 fields

Chip number (CN)	Length of field in chips	Length of field in symbols		Contents of field
0-1951	1952	Cf table 8AA		Data symbols
1952-2975	1024	–		Midamble
2976-4927	1952	Cf table 8AA		Data symbols
4928-5119	192	–		Guard period

Figure 18AC: Burst structure of burst type 1. GP denotes the guard period and CP the chip periods

5B.3.2.2 Burst Type 2

Burst type 2 can be used for uplink and downlink. It offers a longer data field than burst type 1 at the cost of a shorter midamble. Due to the shorter midamble field the burst type 2 supports a maximum number of training sequences of 4 or 8 only, depending on the cell configuration.

The data fields of the burst type 2 are 2208 chips long. The corresponding number of symbols depends on the spreading factor, as indicated in table 8AA above. The guard period for the burst type 2 is 192 chip periods long. Burst type 2 is shown in Figure 18AD. The contents of the burst fields are described in table 8AC.

Table 8AC: The contents of burst type 2 fields

Chip number (CN)	Length of field in chips	Length of field in symbols		Contents of field
0-2207	2208	cf table 8AA		Data symbols
2208-2719	512	–		Midamble
2720-4927	2208	cf table 8AA		Data symbols
4928-5119	192	–		Guard period

Figure 18AD: Burst structure of the burst type 2. GP denotes the guard period and CP the chip periods

5B.3.2.3 Burst Type 3

Burst type 3 is used for uplink only. Due to the longer guard period it is suitable for initial access or access to a new cell after handover. It offers the same number of training sequences as burst type 1.

The data fields of the burst type 3 have a length of 1952 chips and 1760 chips, respectively. The corresponding number of symbols depends on the spreading factor, as indicated in table 8AA above. The midamble of burst type 3 has a length of 1024 chips. The guard period for the burst type 3 is 384 chip periods long. Burst type 3 is shown in Figure 18AE. The contents of the burst fields are described in table 8AD.

Table 8AD: The contents of burst type 3 fields

Chip number (CN)	Length of field in chips	Length of field in symbols		Contents of field
0-1951	1952	Cf table 8AA		Data symbols
1952-2975	1024	–		Midamble
2976-4735	1760	Cf table 8AA		Data symbols
4736-5119	384	–		Guard period

Figure 18AE: Burst structure of the burst type 3. GP denotes the guard period and CP the chip periods

5B.3.2.3A Burst Type 4

The burst type 4 is used for downlink MBSFN operation only and supports a single training sequence.

The data fields of the burst type 4 are 2112 chips long. The corresponding number of symbols is 132 as indicated in table 8AA above. The midamble of burst type 4 has a length of 640 chips. The guard period for the burst type 4 is 256 chip periods long. The burst type 4 is shown in Figure 18AEA. The contents of the burst fields are described in table 8ADA.

Table 8ADA: The contents of burst type 4 fields

Chip number (CN)	Length of field in chips	Length of field in symbols		Contents of field
0-2111	2112	Cf table 8AA		Data symbols
2112-2751	640	–		Midamble
2752-4863	2112	Cf table 8AA		Data symbols
4864-5119	256	–		Guard period

Figure 18AEA: Burst structure of the burst type 4. GP denotes the guard period and CP the chip periods

5B.3.2.4 Transmission of TFCI

All burst types 1, 2, 3 and 4 provide the possibility for transmission of TFCI.

The transmission of TFCI is negotiated at call setup and can be re-negotiated during the call. For each CCTrCH it is indicated by higher layer signalling, which TFCI format is applied, except for the MBSFN FACH where the (16,5) bi-orthogonal code is always used for TFCI when TFCI is applied . Additionally for each allocated timeslot it is signalled individually whether that timeslot carries the TFCI or not. The TFCI is always present in the first timeslot in a radio frame for each CCTrCH. If a time slot contains the TFCI, then it is always transmitted using the physical channel with the lowest physical channel sequence number (p) in that timeslot. Physical channel sequence numbering is determined by the rate matching function and is described in [7].

The transmission of TFCI is done in the data parts of the respective physical channel. In DL the TFCI code word bits and data bits are subject to the same spreading procedure as depicted in [8]. In DL, the modulation applied to the TFCI code word bits is the same as that applied to the data symbols. In UL, independent of the SF that is applied to the data symbols in the burst, the data in the TFCI field are always spread with SF=32 using the channelisation code in the branch with the highest code numbering of the allowed OVSF sub tree, as depicted in [8]. Hence the midamble structure and length is not changed. The TFCI code word is to be transmitted directly adjacent to the midamble, possibly after the TPC. Figure 18AF shows the position of the TFCI code word in a traffic burst in downlink. Figure 18AG shows the position of the TFCI code word in a traffic burst in uplink.

Figure 18AF: Position of the TFCI code word in the traffic burst in case of downlink

Figure 18AG: Position of the TFCI code word in the traffic burst in case of uplink

Two examples of TFCI transmission in the case of multiple DPCHs used for a connection are given in the Figure 18AH and Figure 18AI below. Combinations of the two schemes shown are also applicable.

Figure 18AH: Example of TFCI transmission with physical channels multiplexed in code domain

Figure 18AI: Example of TFCI transmission with physical channels multiplexed in time domain

5B.3.2.5 Transmission of TPC

Burst types 1, 2 and 3 for dedicated and shared channels provide the possibility for transmission of TPC in uplink.

The transmission of TPC is done in the data parts of the traffic burst. Independent of the SF that is applied to the data symbols in the burst, the data in the TPC field are always spread with SF=32 using the channelisation code in the branch with the highest code numbering of the allowed OVSF sub tree, as depicted in [8]. Hence the midamble structure and length is not changed. The TPC information is to be transmitted directly after the midamble. Figure 18AJ shows the position of the TPC in a traffic burst.

For every user the TPC information shall be transmitted at least once per transmitted frame. If a TFCI is applied for a CCTrCH, TPC shall be transmitted with the same channelization codes and in the same timeslots as the TFCI. If no TFCI is applied for a CCTrCH, TPC shall be transmitted using the physical channel corresponding to physical channel sequence number p=1. Physical channel sequence numbering is determined by the rate matching function and is described in [7].

Figure 18AJ: Position of TPC information in the traffic burst

The length of the TPC field is N_TPC bits. The TPC field is formed via repetition encoding a single bit b_TPC, N_TPC times.

The relationship between b_TPC and the TPC command is shown in table 8AE.

Table 8AE: TPC bit pattern

bTPC	TPC command	Meaning
0	‘Down’	Decrease Tx Power
1	‘Up’	Increase Tx Power

5B.3.2.6 Timeslot formats

5B.3.2.6.1 Downlink timeslot formats

The downlink timeslot format depends on the spreading factor, midamble length and on the number of TFCI code word bits, as depicted in the table 8AF. For MBSFN operation the timeslot format also depends upon the symbol modulation scheme used. Slot formats 20-27 are only applicable to MBSFN operation with burst type 4.

Table 8AF: Time slot formats for the Downlink

Slot Format #	Spreading Factor	Midamble length (chips)	NTFCI code word (bits)	Bits/slot	NData/Slot (bits)	Ndata/data field (bits)
0	32	1024	0	244	244	122
1	32	1024	4	244	240	120
2	32	1024	8	244	236	118
3	32	1024	16	244	228	114
4	32	1024	32	244	212	106
5	32	512	0	276	276	138
6	32	512	4	276	272	136
7	32	512	8	276	268	134
8	32	512	16	276	260	130
9	32	512	32	276	244	122
10	1	1024	0	7808	7808	3904
11	1	1024	4	7808	7804	3902
12	1	1024	8	7808	7800	3900
13	1	1024	16	7808	7792	3896
14	1	1024	32	7808	7776	3888
15	1	512	0	8832	8832	4416
16	1	512	4	8832	8828	4414
17	1	512	8	8832	8824	4412
18	1	512	16	8832	8816	4408
19	1	512	32	8832	8800	4400
20 (QPSK)	32	640	0	264	264	132
21 (QPSK)	32	640	16	264	248	124
22 (16QAM)	32	640	0	528	528	264
23 (16QAM)	32	640	16	528	512	256
24 (QPSK)	1	640	0	8448	8448	4224
25 (QPSK)	1	640	16	8448	8432	4216
26 (16QAM)	1	640	0	16896	16896	8448
27 (16QAM)	1	640	16	16896	16880	8440

5B.3.2.6.2 Uplink timeslot formats

The uplink timeslot format depends on the spreading factor, midamble length, guard period length and on the number of TFCI code word bits. Due to TPC, different amount of bits are mapped to the two data fields. The timeslot formats are depicted in the table 8AG. Note that slot format #90 shall only be used for HS_SICH.

Table 8AG: Time slot formats for the Uplink

Slot Format #	Spreading Factor	Midamble length (chips)	Guard Period (chips)	NTFCI code word (bits)	NTPC (bits)	Bits/slot	NData/Slot (bits)	Ndata/data field(1) (bits)	Ndata/data field(2) (bits)
0	32	1024	192	0	0	244	244	122	122
1	32	1024	192	0	2	244	242	122	120
2	32	1024	192	4	2	244	238	120	118
3	32	1024	192	8	2	244	234	118	116
4	32	1024	192	16	2	244	226	114	112
5	32	1024	192	32	2	244	210	106	104
6	32	512	192	0	0	276	276	138	138
7	32	512	192	0	2	276	274	138	136
8	32	512	192	4	2	276	270	136	134
9	32	512	192	8	2	276	266	134	132
10	32	512	192	16	2	276	258	130	128
11	32	512	192	32	2	276	242	122	120
12	16	1024	192	0	0	488	488	244	244
13	16	1024	192	0	2	486	484	244	240
14	16	1024	192	4	2	482	476	240	236
15	16	1024	192	8	2	478	468	236	232
16	16	1024	192	16	2	470	452	228	224
17	16	1024	192	32	2	454	420	212	208
18	16	512	192	0	0	552	552	276	276
19	16	512	192	0	2	550	548	276	272
20	16	512	192	4	2	546	540	272	268
21	16	512	192	8	2	542	532	268	264
22	16	512	192	16	2	534	516	260	256
23	16	512	192	32	2	518	484	244	240
24	8	1024	192	0	0	976	976	488	488
25	8	1024	192	0	2	970	968	488	480
26	8	1024	192	4	2	958	952	480	472
27	8	1024	192	8	2	946	936	472	464
28	8	1024	192	16	2	922	904	456	448
29	8	1024	192	32	2	874	840	424	416
30	8	512	192	0	0	1104	1104	552	552
31	8	512	192	0	2	1098	1096	552	544
32	8	512	192	4	2	1086	1080	544	536
33	8	512	192	8	2	1074	1064	536	528
34	8	512	192	16	2	1050	1032	520	512
35	8	512	192	32	2	1002	968	488	480
36	4	1024	192	0	0	1952	1952	976	976
37	4	1024	192	0	2	1938	1936	976	960
38	4	1024	192	4	2	1910	1904	960	944
39	4	1024	192	8	2	1882	1872	944	928
40	4	1024	192	16	2	1826	1808	912	896
41	4	1024	192	32	2	1714	1680	848	832
42	4	512	192	0	0	2208	2208	1104	1104
43	4	512	192	0	2	2194	2192	1104	1088
44	4	512	192	4	2	2166	2160	1088	1072
45	4	512	192	8	2	2138	2128	1072	1056
46	4	512	192	16	2	2082	2064	1040	1024
47	4	512	192	32	2	1970	1936	976	960
48	2	1024	192	0	0	3904	3904	1952	1952
49	2	1024	192	0	2	3874	3872	1952	1920
50	2	1024	192	4	2	3814	3808	1920	1888
51	2	1024	192	8	2	3754	3744	1888	1856
52	2	1024	192	16	2	3634	3616	1824	1792
53	2	1024	192	32	2	3394	3360	1696	1664
54	2	512	192	0	0	4416	4416	2208	2208
55	2	512	192	0	2	4386	4384	2208	2176
56	2	512	192	4	2	4326	4320	2176	2144
57	2	512	192	8	2	4266	4256	2144	2112
58	2	512	192	16	2	4146	4128	2080	2048
59	2	512	192	32	2	3906	3872	1952	1920
59a	1	1024	192	0	0	7808	7808	3904	3904
59b	1	1024	192	0	2	7746	7744	3904	3840
59c	1	1024	192	4	2	7622	7616	3840	3776
59d	1	1024	192	8	2	7498	7488	3776	3712
59e	1	1024	192	16	2	7250	7232	3648	3584
59f	1	1024	192	32	2	6754	6720	3392	3328
59g	1	512	192	0	0	8832	8832	4416	4416
59h	1	512	192	0	2	8770	8768	4416	4352
59i	1	512	192	4	2	8646	8640	4352	4288
59j	1	512	192	8	2	8522	8512	4288	4224
59k	1	512	192	16	2	8274	8256	4160	4096
59l	1	512	192	32	2	7778	7744	3904	3840
60	32	1024	384	0	0	232	232	122	110
61	32	1024	384	0	2	232	230	122	108
62	32	1024	384	4	2	232	226	120	106
63	32	1024	384	8	2	232	222	118	104
64	32	1024	384	16	2	232	214	114	100
65	32	1024	384	32	2	232	198	106	92
66	16	1024	384	0	0	464	464	244	220
67	16	1024	384	0	2	462	460	244	216
68	16	1024	384	4	2	458	452	240	212
69	16	1024	384	8	2	454	444	236	208
70	16	1024	384	16	2	446	428	228	200
71	16	1024	384	32	2	430	396	212	184
72	8	1024	384	0	0	928	928	488	440
73	8	1024	384	0	2	922	920	488	432
74	8	1024	384	4	2	910	904	480	424
75	8	1024	384	8	2	898	888	472	416
76	8	1024	384	16	2	874	856	456	400
77	8	1024	384	32	2	826	792	424	368
78	4	1024	384	0	0	1856	1856	976	880
79	4	1024	384	0	2	1842	1840	976	864
80	4	1024	384	4	2	1814	1808	960	848
81	4	1024	384	8	2	1786	1776	944	832
82	4	1024	384	16	2	1730	1712	912	800
83	4	1024	384	32	2	1618	1584	848	736
84	2	1024	384	0	0	3712	3712	1952	1760
85	2	1024	384	0	2	3682	3680	1952	1728
86	2	1024	384	4	2	3622	3616	1920	1696
87	2	1024	384	8	2	3562	3552	1888	1664
88	2	1024	384	16	2	3442	3424	1824	1600
89	2	1024	384	32	2	3202	3168	1696	1472
89a	1	1024	384	0	0	7424	7424	3904	3520
89b	1	1024	384	0	2	7362	7360	3904	3456
89c	1	1024	384	4	2	7238	7232	3840	3392
89d	1	1024	384	8	2	7114	7104	3776	3328
89e	1	1024	384	16	2	6866	6848	3648	3200
89f	1	1024	384	32	2	6370	6336	3392	2944
90	32	1024	192	0	8	244	236	122	114