1、3404583 0080336 TI7 = Released: July 1 1993 GSM 05.01 Version: 4.1 .O Date: July 1993 Work Item No: Key words: European digital cellular telecommunication system (phase 2); Physical layer on the radio path: General description ETSI European Telecommunications Standards Institute ETSI Secretariat: F
2、- 06921 Sophia Antipolis Cedex . France TP. + 33 92 94 42 00 TF. + 33 93 65 47 16 Tx. 47 00 40 F This is an unpublished work the copyright in which vests in the European Telecommunications Standards Institute. All rights reserved. The information contained herein is the propetry of ETSI and no part
3、may be reproduced or used except as authoriced by contract or other written permission. The copyright and the foregoing restriction on reproduction and use extend to all media in which the information may be embodied. 3404583 0080337 953 Page 3 GSM 05.01 (4.1.0): July 1993 Contents 1.scope 5 2.Setof
4、channels . 5 3 . Reference configuration . 6 4 . The block structures . 6 5 . Multiple access and timeslot structure . 7 5.1 Hyperrames. superframes and muttiframes 7 5.2 Time slots and bursts 7 5.3 Channel organization 9 6 . Frequency hopping capability 9 7 . Coding and interleaving . 11 8.Modulati
5、on 11 9 . Transmission and reception -12 1 O . Other layer 1 functions . 12 11 . Performance 13 ANNEX A: Reference Configuration 14 ANNEX B: Relations between recommendations . 15 Previous page is blank Page 5 GSM 05.01 (4.1 .O): July 1993 340Y583 0080338 89T 9 1. Scope This technical specification
6、is an introduction to the 05 series of the GSM technical specifications for GSM and DCS 1800. It is not of a mandatory nature, but consists in a general description of the organization of the physical layer with reference to the technical specifications where each part is specified in details. It in
7、troduces furthermore, the reference configuration that will be used throughout this series of technical specifications. 2. Set of channels The radio subsystem provides a certain number of logical channels that can be separated into two categories according to GSM 04.03: 1) the traffic channels (TCH)
8、: they are intended to carry two typec of user information streams: encoded speech and data. Two types of traffic channels are defined: Bm or full-rate (TCHF) and Lm or half-rate (TCHR1) traffic channels. For the purpe of this series of technical specifications, the following traffic channels are di
9、stinguished: - - - - - - - - cell broadcast channel (CBCH) full rate speech TCH (TCH/FS) half rate speech TCH (TCH/HS) 9.6 kbWs full rate data TCH (TCHF9.6) 4.8 kbis full rate data TCH (TCHF4.8) 4.8 kbWs half rate data TCH (TCH/H4.8) s 2.4 kbus full rate data TCH (TCHF2.4) s 2.4 kbWs half rate data
10、TCH (TCHM2.4) 2) the signaling channels: these can be subdivided into BCCH (broadcast contrd channel), CCCH (common control channel), SDCCH (stand-alone dedicated control channel) and ACCH (associated control channel). An associated control channel is always allocated in conjunction with, either a T
11、CH, or a SDCCH. Two types of ACCH are defined: continuous stream (slow ACCH) and burst stealing mode (fast ACCH). For the purpose of this series of technical specifications, the following signalling channels are distinguished: - stand-alone dedicated control channel, four of them mapped on the same
12、basic physical channel as the CCCH (SDCCH/4) - stand-alone dedicated control channel, eight of them mapped on a separate basic physical channel (SDCCHI8) - full rate fast associated control channel (FACCHF) half rate fast associated control chmnel (FACCHM) - slow, TCH/F associated, control channel (
13、SACCHTTF) - slow, TCH/H associated, control channel (SACCHmi) - slow, SDCCH/4 associated, control channel (SACCH/C4) - slow, SDCCHI8 associated, control channel (SACCHK8) - broadcast control channel (BCCH) - random access channel (e uplink CCCH) (RACH) - paging channel (part of downlink CCCH) (PCH)
14、- access grant channel (part of downlink CCCH) (AGCH) When there is no need to distinguish between different subcategories of the same logical channel, only the generic name will be used, meaning also all the subcategories (SACCH will mean all categories of SACCHs, SACCH/T will mean both the slow, T
15、CH associated, control channels,). The logical channels mentioned above are mapped on physical channels that are described in this set of technical specifications. The different physical channels provide for the transmission of information pertaining to higher layers according to a block structure.
16、Previous page is blank 3. Reference configuration Type of channel Page ti GSM 05.01 (4.1 .O): July 1993 net bit rate (kbit/s) For the purpose of elaborating the physical layer specification, a reference configuration of the transmission chain is used as shown in annex A. This reference configuration
17、 also indicates which parts are dealt with in details in which technical specification. It shall be noted that only the transmission part is specified, the receiver being specified only via the overall performance requirements. With reference to this configuration, the technical specifications in th
18、e 05 series address the following functional units: 182+78 tbd 60 60 36 - - - - GSM 05.02: burst building, and burst multiplexing; GSM 05.03: coding, reordering and partitioning, and interleaving; GSM 05.04: differential encoding, and modulation; GSM 05.05: transmitter, antenna, and receiver (overal
19、l performance). 20 tbd 5 10 10 This reference configuration defines also a number of points of vocabulary in relation to the name of bits at different levels in the configuration. It must be outlined, in the case of the encrypted bits, that they are named only with respect to their position after th
20、e encryption unit, and not to the fact that they pertain to a flow of information that is actually encrypted. 4. The block structures The different block structures are described in more detail in GSM 05.03 (Channel coding). A summarised description appears in table 1, in terms of net bit rate, leng
21、th and recurrence of Mocks. Table 1 : Channel block structures full rate speech TCH1 half rate speech TCH2 13,O tbd data TCH (9,6 kbt/s)3 data TCH (4,8 kbt/s)3 dataTCH (52,4 kbt/s)3 full rate FACCH (FACCHF) half rate FACCH (FACCH/H) SDCCH SACCH (with TCH)4 SACCH (with SDCCH)4 BCCH AGCH5 PCH5 RACH5 C
22、BCH 12,o 6,O 3,6 92 4,6 598/765(-0,782) 299/765(-0,391) 598/765(-0,782) n*598/765(-0,782) p*598/765(-0,782) 598/765(-0,782) 1 1 Y300(-0,383) r*26/7=(*1034) block length (bits) block recurrence (m) 184 184 184 168+16 168+16 184 184 184 8 184 20 40 480 6120/13 (471) 3060/13 (-235) 3060/13 (-235) 3060/
23、13 (-235) 3060/13 (-235) 3060/13 (-235) 3060/13 (-235) Note 1: Note 2: Note 3: Note 4: Note 5: for full rate speech, the block is divided into two classes according to the importance of the bas (1 82 bits for class I and 78 bits for class Il). the half rate speech TCH is envisaged for future evoluti
24、on. for data services, the net bit rate is the adaptation rate as defined in GSM 04.21. on SACCH, 16 bits are reserved for control information on layer 1, and 168 bits are used for higher layers. CCCH channels are common to all users of a cell; the total number of blocks (n, p, r) per recurrence per
25、iod is adjustable on a cell by cell basis and depends upon the parameters (BS-CC-CHANS, BS-BCCH-SDCCHCOMB and BS-AG-BLKSRES) broadcast on the BCCH and specified in GSM 05.02 and GSM 04.08. 3404583 OOOL40 448 Page 7 GSM 05.01 (4.1.0): July 1993 5. Multiple access and timeslot structure The access sch
26、eme is Time Division Multiple Access FDMA) with eight basic physical channels per carrier. The carrier separation is 200 kHz. A physical channel is therefore defined as a sequence of TDMA frames, a time slot number (modulo 8) and a frequency hopping sequence. The basic radio resource is a time slot
27、lasting - 576.9 ps (1526 ms) and transmitting information at a modulation rate of - 270.833 kbWs (1625/6 kbitk). This means that the time slot duration, including guard time, is 156.25 bit durations. We shall describe successively the time frame structures, the time slot structures and the channel o
28、rganization. The appropriate specifications will be found in GSM 05.02 (muitiplexing and muitiple access). 5.1 Hyperframes, superframes and multiframes A diagrammatic representation of all the time frame structures is in figure 1. The longest recurrent time period of the structure is called hyperfra
29、me and has a duration of 3h 2mn 53s 76oms (or 12533.76 s). The TDMA frames are numbered modulo this hyperframe (TMA frame number, or FN, from O to 271 5647). This long period is needed to support cryptographic mechanisms defined in GSM 03.20. One hyperframe is subdivided in 2048 superframes which ha
30、ve a duration of 6.12 seconds. The superframe is the least common multiple of the time frame structures. The superframe is itself subdivided in multiframes; two types of muitiframes exist in the system: - a 26frame multiframe (51 per superframe) with a duration of 120 ms, comprising 26 TDMA frames.
31、This muitiiame is used to carry TCH (and SACCHm and FACCH. - a 51-frame multiframe (26 per superframe) with a duration of -235.4 ms (306oll3 ms), comprising 51 TDMA frames. This multiframe is used to carry BCCH, CCCH (AGCH, PCH and RACH) and SDCCH (and SACCHK). A TDMA frame, comprising eight time sl
32、ots has a duration of - 4.62 (W13) ms. 5.2 Time slots and bursts The time slot is a time interval of - 576.9 ps (1 5/26 ms), that is 156.25 bit durations, and its physical content is called a burst. Four different types of bursts exist in the system. A diagram of these bursts appears in figure 1. -
33、normal burst (NB): this burst is used to carry information on traffic and control channels, except for RACH. It contains 11 6 encrypted bits and includes a guard time of 8.25 bit durations (- 30.46 ps). frequency correction burst (FB): this burst is used for frequency synchronization of the mobile.
34、It is equivalent to an unmodulated carrier, shifted in frequency, with the same guard time as the normal burst. It is broadcast together with the BCCH. The repetition of FBs is also named frequency correction channel (FCCH). synchronization burst (SB): this burst is used for time synchronization of
35、the mobile. It contains a long training sequence and carries the information of the TDMA frame number (FN) and base station identity code (BSIC, see GSM 03.03). It is broadcast together with the frequency correction burst. The repetition of synchronization bursts is also named synchronization channe
36、l (SCH). access burst (AB): this burst is used for random access and is characterized by a longer guard period (68.25 bit durations or 252 p) to cater for burst transmission from a mobile which does not know the timing advance at the first access (or after handover). This allows for a distance of 35
37、 km. This burst is used in the RACH and after a handover. In exceptional cases of cell radii larger than 35 km, some possible meacures are described in GSM 03.30. - - - - Pagt - GSM 05.01 (4.1.0): July 1993 I I :- I I I I I I I I I I I I I I l I I I I 3404583 0080L4L 384 = r- ib! c 5 Figure 1 : Time
38、 frames time slots and bursts 3404583 0080342 210 (a) Page 9 TTTTTTTTT TATTTTTTT TTTTT - GSM 05.01 (4.1.0): July 1993 (b) 5.3 Channel organization Tt Tt T t T t T t tAT t T t T t T tT t T t a The channel organization for the traffic channels (TCH), FACCHs and SACCHF uses the 26frame multiframe. It i
39、s organized as described in figure 2, where only one time slot per TDMA frame is considered, (a) case of one full rate TCH (b) case of two haif rate TCHs T, t: TDMA frame for TCH -: idle TDMA frame A, a: TDMA frame for SACCHTT Figure 2: Traffic channel organization The FACCH is transmitted by preemp
40、ting hat or ail of the information bits of the bursts of the TCH to which it is associated (see GCM 05.03). The channel organization for the control channels (except FACCHs and SACCHm uses the 51-frame multiframe. It is organized in the downlink and uplink as described in figure 3. 6. Frequency hopp
41、ing capability The frequency hopping capability is optionally used by the network operator on ail 01 part of its network. The main advantage of this feature is to provide diversity on one transmission link (especialiy to increase the efficiency of coding and interleaving for slowly moving mobile sta
42、tions) and also to average the quality on all the communications through interferers diversity. It is implemented on all mobile stations. The principle of slow frequency hopping is that every mobile transmits its time slots according to a sequence of frequencies that it derives from an algorithm. Th
43、e frequency hopping occurs between time slots and, therefore, a mobile station transmits (or receives) on a fixed frequency during one time slot (- 57 ps) and then must hop before the time slot on the next TDMA frame. Due to the time needed for monitoring other base stations the time allowed for hop
44、ping is approximately 1 ms, according to the receiver implementation. The receive and transmit frequencies are always duplex frequencies. The frequency hopping sequences are orthogonal inside one cell (e no collisions occur between communications of the same cell), and independent from one cell to a
45、n homolog cell (e using the same set of RF channels, or cell allocation). The hopping sequence is derived by the mobile from parameters broadcast at the channel assignment, namely, the mobile allocation (set of frequencies on which to hop), the hopping sequence number of the cell (which allows diffe
46、rent sequences on homolog cells) and the index offset (to distinguish the different mobiles of the cell using the same mobile allocation). The non- hopping case is included in the algorithm as a special case. The different parameters needed and the aigorithm are specified in GSM 05.02. It must be no
47、ted that the basic physical channel supporting the BCCH does not hop. Page 10 GSM 05.01 (4.1 .O): July 1993 -Q-O- -8-8- -8-3- - -O- 880 - 890 MHz : mobile transmit, base receive 925 - 935 MHz : base transmit, mobile receive The RF channel spacing is 200 kHz, allowing for 174 (GSM) or 374 (DCS 1800)
48、radio frequency channels, thus leaving a guard band of 200 kHz at each end of the subbands. The specific RF channels, together with the requirements on the transmitter and the receiver will be found in GSM 05.05 (Transmission and reception). In order to allow for low power consumption for different
49、categories of mobiles (eg. vehicle mounted, hand-held, ), different power classes have been defined. For GSM there are five per classes with the maximum power class having 20 W peak output power (Ca 2.5 W mean output power) and the minimum having 0.8 W peak output power. For DCS 1800 there are two per classes of 1 W peak wtput power (ca 0.125 W mean) and 0.25 W peak output power. The classes are specified in GSM 05.05. The requirements on the overall transmission quality together with the measurement conditions are also in GSM 05.05. 10. Other layer 1 f
