1、m 3404583 O073487 110 m ETSI/TC SMG Released by : ETSI/PT 12 Release date: February 1992 RELEASE NOTE Recommendation GSM 05.01 Physical Layer on the Radio Path: General Decsription Previously distributed version : 3.3.2 New Released version February 92 : 3.3.2 (Release 92, Phase 1) 1. Reason for cha
2、ncres No changes since the previously distributed version. ETS I -GS M Technical Specification GSM 05.01 Version 3.2.2 UDC: 621.396.21 Key words: European Digital Cellular Telecommunications System, Global System for Mobile Communications (GSM) European digital cellular telecommunication system (pha
3、se 1); Physical Layer on the Radio Path: General Description ETSI European Telecommunications Standards Institute ETSI Secretariat: B.P.152 . F - 06561 Valbonne Cedex . France TP. + 33 92 94 42 O0 TF. + 33 93 65 47 16 Tx. 47 O0 40 F Copyright European Telecommunications Standards institute 1992. Ali
4、 rights reserved. No part may be reproduced or used except as authorised 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 0073489 T93 m PREFATORY NOTE ETSI has constitu
5、ted stable and consistent documents which give specifications for the implementation of the European Cellular Telecommunications System. Historically, these documents have been identified as ”GSM recommendations”. Some of these recommendations may subsequently become Interim European Telecommunicati
6、ons Standards (I-ETSs) or European Telecommunications Standards (ETSs), whilst some continue with the status of ETSI-GSM Technical Specifications. These ETSI-GSM Technical Specifications are for editorial reasons still referred to as GSM recommendations in some current GSM documents. The numbering a
7、nd version control system is the $;ame for ETSI-GSM Technical Specifications as for “GSM recommendations”, W 3404583 0073490 705 W ETSI /GSM GSM Rec 05.01 version 3.3.2 GSM Recommendation:05.01 Title: PHYSICAL LAYER ON THE RADIO PATH: GENERAL DESCRIPTION Date : January 1991 CONTENTS : 1. SCOPE 2. SE
8、T OF C“ELS 3. REFERENCE CONFIGURATION 4. THE BLOCK STRUCTURES 5. MULTIPLE ACCESS AND TIME SLOT STRUCTURES 6. FREQUENCY HOPPING CAPABILITIES 7. CODING AND INTERLEAVING 8. MODULATION 9. TRANSMISSION AND RECEPTION 10. OTHER LAYER 1 FUNCTIONS 11. PERFORMANCE ANNEXES: 1. Reference configuration 2. Relati
9、ons between recommendations Number of pages: 11 M 3404583 0071491 641 M Rec.05.01 (version 3.3.2) RECOMMENDATION 05.01 PHYSICAL LAYER ON THE RADIO PATH GENERAL DESCRIPTION 1. SCOPE : This recommendation is an introduction to the O5 series of the GSM recommendations. It is not of a mandatory nature,
10、but consists in a general description of the organization of the physical layer with reference to the recommendations where each part is specified in details. It introduces furthermore, the reference configuration that will be used throughout this series of recommendations. 2. SET OF CHANNELS: The r
11、adio subsystem provides a certain number of logical channels that can be separated into two categories according to Rec.04.03: 1) the traffic channels (TCH) : they are intended to carry two types of user information streams: encoded speech and data. Two types of traffic channels are defined: Bm or f
12、ull-rate (TCH/F) and Lm or half- rate (TCH/H) traffic channels. For the purpose of this series of recommendations, the following traffic channels are distinguished: - full rate speech TCH (TCH/FS) - half rate speech TCH (TCH/HS) - 9.6 kbit/s full rate data TCH (TCH/F9.6) - 4.8 kbit/s full rate data
13、TCH (TCH/F4.8) - 4.8 kbit/s half rate data TCH (TCH/H4.8) - 5 2.4 kbit/s full rate data TCH (TCH/F2.4) - s 2.4 kbit/s half rate data TCH (TCH/H2.4) - cell broadcast channel (CBCH) 2) the signaling channels: these can be sub-divided into BCCH (broadcast control channel), CCCH (common control channel)
14、, SDCCH (stand-alone dedicated control channel) and ACCH (associated control channel). An associated control channel is always allocated in conjunction with, either a TCH, or a SDCCH. Two types of ACCH are defined: continuous stream (slow ACCH) and burst stealing mode (fast ACCH). For the purpose of
15、 this series of recommendations, the following signalling channels are distinguished: - stand-alone dedicated control channel, four of them mapped on the - stand-alone dedicated control channel, eight of them mapped on a - full rate fast associated control channel (FACCH/F) - half rate fast associat
16、ed control channel (FACCH/H) - slow, TCH/F associated, control channel (SACCH/TF) - slow, TCH/H associated, control channel (SACCH/TH) - slow, SDCCH/4 associated, control channel (SACCH/C4) - slow, SDCCH/B associated, control channel (SACCH/C8) - broadcast control channel (BCCH) - random access chan
17、nel (ie uplink CCCH) (RACH) same basic physical channel as the CCCH (SDCCH/4) separate basic physical channel (SDCCH/8) 3404583 0073492 588 M Rec.05.01 (version 3.3.2) - paging channel (part of downlink CCCH) (PCH) - access grant channel (part of downlink CCCH) (AGCH) When there is no need to distin
18、guish between different sub-categories of the same logical channel, only the generic name will be used, meaning also all the sub-categories (SACCH will mean all categories of SACCHs, SACCH/T will mean both the slow, TCH associated, control channels,). The logical channels mentioned above are mapped
19、on physical channels that are described in this set of recommendations. The different physical channels provide for the transmission of information pertaining to higher layers according to a block structure. 3. REFERENCE CONFIGURATION: For the purpose of elaborating the physical layer specification,
20、 a reference configuration of the transmission chain is used as shown in annex 1. This reference configuration also indicates which parts are dealt with in details in which recommendation. It shall be noted that only the transmission part is specified, the receiver being specified only via the overa
21、ll performance requirements. With reference to this configuration, the recommendations in the 05 series address the following functional units: - Rec.05.02: burst building, and burst multiplexing; - Rec.05.03: coding, reordering and partitioning, and interleaving; - Rec.05.04: differential encoding,
22、 and modulation; - Rec.05.05: transmitter, antenna, and receiver (overall performance). 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 th
23、ey are named only with respect to their position after the encryption unit, and not to the fact that they pertain to a flow of information that is actually encrypted. 4. TEE BLOCK STRUCTURES: The different block structures are described in more detail in Rec. 05.03 (Channel coding). A summarised des
24、cription appears in the table below, in terms of net bit rate, length and recurrence of blocks. for full rate speech, the block is divided into two classes according to the importance of the bits (182 bits for class I and 78 bits for class II). the half rate speech TCH is envisaged for future evolut
25、ion. for data services, the net bit rate is the adaptation rate as defined in Rec.04.21, necessary to transmit control information to modems. 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; t
26、he total number of blocks (n, p, r) per recurrence period is adjustable on a cell by cell basis and depends upon the parameters (BSCC-CHANS, BS-BCCH-SDCCHCOMB and BS-AG-BLKS-RES) broadcast on the BCCH and specified in 05.02 and 04.08. = 3404583 0073493 414 Rec.OS.01 (version 3.3.2) Type of channel f
27、ull rate speech TCH1 half rate speech TCH2 data TCH (9,6 kbit/) data TCH (4,8 kbit/) data TCH (52,4 kbit/s): full rate FACCH half rate FACCH SDCCH SACCH (with TCH) SACCH (with SDCCH) BCCH AGCH 5 PCH 5 RACH 5 net bit rate (kbit/s) 13,O tbd 9,2 4,6 598/765(-0,782) 115/300(-0,383) 299/765(-0,391) 598/7
28、65(-0,782) I* 59 8 /7 65 (-0 7 82 ) 1*598/765(-0,782) r*26/765(-0,034) block length (bits ) 182 + 78 tbd 60 60 72 184 184 184 168 + 16 168 + 16 184 184 184 8 ,lock recurrence (m) 20 tbd 5 10 20 20 40 3060/13 (-235) 480 6120/13 (-471) 3060/13 (-235) 3060/13 (-235) 3060/13 (-235) 3060/13 (-235) 5. MUL
29、TIPLE ACCESS AND TIME SLOT STRUCTURE: The access scheme is Time Division Multiple Access (TDMA) with 8 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 s
30、equence. The basic radio resource is a time slot lasting - 576.9 ps (15/26 ms) and transmitting information at a modulation rate of - 270.833 kbit/s (1625/6 kbit/s). This means that the time slot duration, including guard time, is 156.25 bit durations. We shall describe successively the time frame s
31、tructures, the time slot structures and the channel organization. The appropriate specifications will be found in Rec.05.02 (multiplexing and multiple access). 5.1 Byperframes, superframes and multiframes: A diagrammatic representation of all the time frame structures is in figure 1. The longest rec
32、urrent time period of the structure is called hyperframe and has a duration of 3h 28mn 53s 760ms (or 12533.76 s). The TDMA frames are numbered modulo this hyperframe (TDMA frame number, or FN, from O to 2715647). This long period is needed to support cryptographic mechanisms defined in 03.20. One hy
33、perframe is subdivided in 2048 superframes which have 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 multiframes exist in the system: - a 26-frame multiframe (51 per superframe) wi
34、th a duration of 120 ms, comprising 26 TDMA frames. This multiframe is used to carry TCH (and SACCH/T) and FACCH. m 3404583 0073494 350 m Rec.05.01 (version 3.3.2) I - rn O W IC rn (1 VI c E W Cu r (1 VI a E - E L c 4 3 C I- 02 w ls v: h o II v - a E -t a C v a w c o II a E : - L a C z r r- w O N W
35、w O Cu r- 7- I I I I I I I I I I I I I I I I I I I I l I l I l l I I I I I I I I I I l I I I I I I I l I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I m o E al 3 U m rn c O 61 N c .- - .- z o c )i VI - m I-O m c c L a - rn Y c L m N c O .- i=H
36、L c o c % cn E O Rec.05.01 (version 3.3.2) - a 51-frame multiframe (26 per superframe) with a duration of - 235.4 ms (3060/13 ms), comprising 51 TDMA frames. This multiframe is used to carry BCCH, CCCH (AGCH, PCH and RACH) and SDCCH (and SACCH/C). A TDMA frame, comprising 8 time slots has a duration
37、 of - 4.62 (60/13) ms . 5.2 Time slots and bursts: The time slot is a time interval of - 576.9 ps (15/26 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. - normal burst (N
38、B): this burst is used to carry information on traffic and control channels, except for RACH. It contains 116 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. It is equivale
39、nt 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 the mobile.
40、It contains a long training sequence and carries the information of the TDMA frame number (FN) and base station identity code (BSIC, see Rec.03.03). It is broadcast together xith the frequency correction burst. The repetition of synchronization bursts is also named synchronization channel (SCH). - a
41、ccess burst (AB): this burst is used for random access and is characterized by a longer guard period (68.25 bit durations or 252 ps) 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 km. This
42、 burst is used in the RACH and after a handover. In exceptional cases of cell radii larger than 35 km, some possible measures are described in Rec.03.30. 5.3 Channel organization: The channel organization for the traffic channels (TCH), FACCHs and SACCH/T uses the 26-frame multiframe. It is organize
43、d as described in the following figure, where only one time slot per TDMA frame is considered. (a) case of one full rate TCH T, t: TDMA frame for TCH (b) case of two half rate TCHs A, a: TDMA frame for SACCH/T -: idle TDMA frame 3404583 0071496 I123 Rec.05.01 (version 3.3.2) The FACCH is transmitted
44、 by preempting half of the information bits of the bursts (on 8 consecutive T or t frames) of the TCH to which it is associated. The channel organization for the control channels (except FACCHs and SACCH/T) uses the 51-frame multiframe. It is organized in the downlink and uplink as described in figu
45、re 2. 6. FREQUENCY HOPPING CAPABILITY: The frequency hopping capability is optionally used by the network operator on all or part of its network. The main advantage of this feature is to provide diversity on one transmission link (especially to increase the efficiency of coding and interleaving for
46、slowly moving mobile stations) 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 deriv
47、es from an algorithm. The frequency hopping occurs between time slots and, therefore, a mobile station transmits (or receives) on a fixed frequency during one time slot (a 577 ps) and then must hop before the time slot on the next TDMA frame. Due to the time needed for monitoring other base stations
48、 the time allowed for hopping 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 (ie no collisions occur between communications of the same cell), and inde
49、pendent from one cell to an homolog cell (ie using the same set of FtF 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 different 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 a8 a special case. The different parameters needed and the algor
