1、 ETSI TS 103 326 V1.1.1 (2015-04) Smart Body Area Network (SmartBAN); Enhanced Ultra-Low Power Physical Layer TECHNICAL SPECIFICATION ETSI ETSI TS 103 326 V1.1.1 (2015-04)2 Reference DTS/SmartBAN-007 Keywords air interface, health, protocol ETSI 650 Route des Lucioles F-06921 Sophia Antipolis Cedex
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6、tilized in any form or by any means, electronic or mechanical, including photocopying and microfilm except as authorized by written permission of ETSI. The content of the PDF version shall not be modified without the written authorization of ETSI. The copyright and the foregoing restriction extend t
7、o reproduction in all media. European Telecommunications Standards Institute 2015. All rights reserved. DECTTM, PLUGTESTSTM, UMTSTMand the ETSI logo are Trade Marks of ETSI registered for the benefit of its Members. 3GPPTM and LTE are Trade Marks of ETSI registered for the benefit of its Members and
8、 of the 3GPP Organizational Partners. GSM and the GSM logo are Trade Marks registered and owned by the GSM Association. ETSI ETSI TS 103 326 V1.1.1 (2015-04)3 Contents Intellectual Property Rights 4g3Foreword . 4g3Modal verbs terminology 4g31 Scope 5g32 References 5g32.1 Normative references . 5g32.
9、2 Informative references 5g33 Symbols and abbreviations . 5g33.1 Symbols 5g33.2 Abbreviations . 6g34 Introduction and Background . 6g35 General PHY Framework . 6g35.0 Introduction 6g35.1 Frequency Spectrum . 6g36 Packet Formats . 7g36.1 Physical-Layer Protocol Data Unit (PPDU) . 7g36.1.0 PPDU Struct
10、ure 7g36.1.1 Preamble . 7g36.1.2 PLCP Header 7g36.1.2.0 PLCP Header Structure . 7g36.1.2.1 Packet Length 7g36.1.2.2 PHY Scheme . 8g36.1.2.3 BCH Parity Bits 8g36.1.2.4 Header Parity . 8g36.1.3 PSDU 8g37 Modulation and Error Control 8g37.1 PPDU Formation 8g37.2 Modulation . 9g37.3 Repetition and Forwa
11、rd Error Control (FEC) . 9g37.3.1 Repetition 9g37.3.2 BCH (127,113,t=2) Encoding . 9g37.3.3 BCH (36, 22, t=2) Encoding . 10g37.4 Scrambling . 10g38 Other Requirements 10g38.1 Packet Length . 10g38.2 Clear Channel Assessment . 11g3Annex A (informative): Bibliography . 12g3History 13g3ETSI ETSI TS 103
12、 326 V1.1.1 (2015-04)4 Intellectual Property Rights IPRs essential or potentially essential to the present document may have been declared to ETSI. The information pertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be found in ETSI SR 000 314:
13、 “Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in respect of ETSI standards“, which is available from the ETSI Secretariat. Latest updates are available on the ETSI Web server (http:/ipr.etsi.org). Pursuant to the ETSI IPR Policy, no investigation,
14、including IPR searches, has been carried out by ETSI. No guarantee can be given as to the existence of other IPRs not referenced in ETSI SR 000 314 (or the updates on the ETSI Web server) which are, or may be, or may become, essential to the present document. Foreword This Technical Specification (T
15、S) has been produced by ETSI Technical Committee Smart Body Area Network (SmartBAN). Modal verbs terminology In the present document “shall“, “shall not“, “should“, “should not“, “may“, “need not“, “will“, “will not“, “can“ and “cannot“ are to be interpreted as described in clause 3.2 of the ETSI Dr
16、afting Rules (Verbal forms for the expression of provisions). “must“ and “must not“ are NOT allowed in ETSI deliverables except when used in direct citation. ETSI ETSI TS 103 326 V1.1.1 (2015-04)5 1 Scope The present document specifies the ultra-low power physical layer (PHY) Smart BAN. The present
17、document applies to short range, wireless communication between wearable sensors devices and the hub coordinator. The present document specifies the PHY for transmitting on the medium. The present document describes: packet formats; modulation; forward error correction. 2 References 2.1 Normative re
18、ferences References are either specific (identified by date of publication and/or edition number or version number) or non-specific. For specific references, only the cited version applies. For non-specific references, the latest version of the reference document (including any amendments) applies.
19、Referenced documents which are not found to be publicly available in the expected location might be found at http:/docbox.etsi.org/Reference. NOTE: While any hyperlinks included in this clause were valid at the time of publication, ETSI cannot guarantee their long term validity. The following refere
20、nced documents are necessary for the application of the present document. 1 ETSI TS 103 325 (V1.1.1) (2015-04): “Smart Body Area Network (SmartBAN); Low Complexity Medium Access Control (MAC) for SmartBAN“. 2.2 Informative references References are either specific (identified by date of publication
21、and/or edition number or version number) or non-specific. For specific references, only the cited version applies. For non-specific references, the latest version of the reference document (including any amendments) applies. NOTE: While any hyperlinks included in this clause were valid at the time o
22、f publication, ETSI cannot guarantee their long term validity. The following referenced documents are not necessary for the application of the present document but they assist the user with regard to a particular subject area. Not applicable. 3 Symbols and abbreviations 3.1 Symbols For the purposes
23、of the present document, the following symbols apply: D Delay eXclusive OR (XOR) ETSI ETSI TS 103 326 V1.1.1 (2015-04)6 3.2 Abbreviations For the purposes of the present document, the following abbreviations apply: Ack Acknowledgement BAN Body Area Network BCH Broadcast Channel BT Bandwidth Time pro
24、duct CCA Clear Channel Assessment CRC Cyclic Redundancy Check ED Energy Detection FEC Forward Error Correction GSFK Gaussian Frequency Shift Keying IFS Inter-Frame Spacing ISM Industrial, Scientific and Medical MAC Medium Access Control MPDU MAC Protocol Data Unit PHY Physical Layer PLCP Physical La
25、yer Convergence Protocol PPDU PHY Protocol Data Unit PSDU Physical Layer Service Data Unit 4 Introduction and Background Modern medical and health monitoring equipment are moving towards the trend of wireless connectivity between the data collection or control centre and the medical devices or senso
26、rs. Therefore, the need for a standardized communication interface and protocol between the actors are required. This network of actors performing some medical monitoring or functions is called a Smart Body Area Network (Smart BAN). The present document specifies the physical layer procedure for Sma
27、rt BAN. 5 General PHY Framework 5.0 Introduction This clause provides the basic PHY framework for the nodes and hubs. 5.1 Frequency Spectrum The frequency of operation shall fall within 2 401 MHz - 2 481 MHz. The channels shall be arranged in blocks of 2 MHz with centre frequencies: fc= 2 402 + 2 n
28、MHz, for n = 0 to 39, where n is the channel number. Table 1 shows the mapping of the channel number to data channel number and control channel number. ETSI ETSI TS 103 326 V1.1.1 (2015-04)7 Table 1: Mapping of Channel Number to Data and Control Channel Numbers Channel Number Centre Frequency (MHz)
29、Channel Type Data Channel Number Control Channel Number 0 2 402 Control 0 1 2 404 Data 0 Data 11 2 424 Data 10 12 426 Control 1 13 2 428 Data 11 Data 38 2 478 Data 36 39 480 Control 2 6 Packet Formats 6.1 Physical-Layer Protocol Data Unit (PPDU) 6.1.0 PPDU Structure Figure 1: PPDU Structure 6.1.1 Pr
30、eamble PPDUs have a sixteen bit preamble used for frequency synchronization, timing synchronization, and automatic gain control. The preamble for all PPDUs shall be 1010101010101010. 6.1.2 PLCP Header 6.1.2.0 PLCP Header Structure The PLCP Header is structured as illustrated in Figure 2. The PLCP he
31、ader consist of the Packet Length, PHY Scheme, Reserved, BCH Parity Bits, and the Header Parity fields. The PLCP header shall be scrambled by the procedure described in clause 7.4. Figure 2: PLCP Header Structure 6.1.2.1 Packet Length The packet length field indicates the length of the PSDU. Preambl
32、e PLCP Header PSDU Bits: 16 LPSDU40 BCH Parity Bits Packet Length Header Parity Bits: 15 14 4 PHY Scheme 4 Reserved 3 ETSI ETSI TS 103 326 V1.1.1 (2015-04)8 6.1.2.2 PHY Scheme The PHY Scheme field describes the forward error control (FEC) type and the repetition type the PPDU employs. The mapping of
33、 the field bits is as described in Table 2. 6.1.2.3 BCH Parity Bits The BCH Parity Bits field shall be generated using a BCH (36,22,t=2) code defined in clause 7.3.3 to protect the Packet Length, PHY Scheme, and Reserved fields. 6.1.2.4 Header Parity The Header Parity field shall be generated by the
34、 CRC polynomial 1 + x + x4 on the Packet Length, PHY Scheme, Reserved, and BCH Parity Bits fields. Table 2: PHY Scheme field bit mapping Field Value b0 b1 FEC Type Field Value b2 b3 Repetition Type 00 None 00 None01 BCH(127,113,2) 01 2 10 Reserved 10 4 11 Reserved 11 Reserved 6.1.3 PSDU The Physical
35、-Layer Service Data Unit (PSDU) is either an encoded or uncoded MAC Protocol Data Unit (MPDU) as defined clause 6.1 of 1. The MPDU may be encoded using a BCH (127,113,t=2) code. The encoding procedure shall be described in clause 7.3. The PSDU shall be scrambled using the procedure described in clau
36、se 7.4. 7 Modulation and Error Control 7.1 PPDU Formation The PPDU is formed from the following process described in Figure 3. The dashed boxes represent operations that are optional. Figure 3: Transmitter Physical Layer Chain MPDU BCH Coding Add PLCP Header Add Preamble Repetition PHY Scheme Add BC
37、H Parity Bits Add Header Parity Bits Packet Length PLCP Header PSDU PPDU Data Scrambling Data Scrambling ETSI ETSI TS 103 326 V1.1.1 (2015-04)9 7.2 Modulation The modulation is Gaussian Frequency Shift Keying (GSFK) with a bandwidth-bit period product BT = 0,5, and modulation index h = 0,5. A symbol
38、 rate, Tsym, of 1 MSymbols/s shall be supported in both Control and Data Channels. Table 3: Physical Layer Throughput Channel (Data/Control) Information Flow Symbol Rate (MSymbols/s) Code Rate Repetition Information Rate (Mbps) Data/Control Downlink/Uplink 1,0 1 1 1,0 Data/Control Downlink/Uplink 1,
39、0 1 2 0,5 Data/Control Downlink/Uplink 1,0 1 4 0,25 Data/Control Downlink/Uplink 1,0 113/127 1 0,89 Data/Control Downlink/Uplink 1,0 113/127 2 0,44 Data/Control Downlink/Uplink 1,0 113/127 4 0,22 7.3 Repetition and Forward Error Control (FEC) 7.3.1 Repetition The hubs and nodes may implement repetit
40、ion coding to reduce errors if required. Should repetition coding be implemented, this shall be indicated in the PHY Scheme field in clause 6.1.2.3. Two repetition schemes shall be supported, 2-repetition, repeating the entire PPDU 2 times, and 4-repetition, repeating the entire PPDU 4 times. When r
41、epetition is employed, the original PPDU along with its repeated versions shall be treated as one single PPDU. An example of 2-repetition and 4-repetition is shown in Figure 4. Figure 4: An example of 2-repetition and 4-repetition 7.3.2 BCH (127,113,t=2) Encoding For error correction control of MPDU
42、, a systematic BCH(127,113,t=2) code may be employed. t indicates the maximum number of bits that can be corrected. The generator polynomial of the BCH(127,113,t=2) code is: g(x) = x14+ x9+ x8+ x6+ x5+ x4+ x2+ x + 1. (1) The encoding process is as follows: 1) Calculate the number of padding bits, Np
43、adding. The number of padding bits depends on the length of the MPDU, LMPDU, and can be calculated as: g1840g3043g3028g3031g3031g3036g3041g3034g3404uni0009g4690g3013g3262g3265g3253g3270g3038g4691 g3400 g1863 g3398uni0009g1838g3014g3017g3005g3022, where k = 113, 2) Append Npaddingzero bits to the end
44、 of the MPDU 3) Partition the padded MPDU into subpackets with length of k 4) Compute the parity bits for each subpackets using the generator polynomial g(x) 2-repetition 4-repetition PPDU PPDU PPDU PPDU PPDU PPDU PPDU PPDU ETSI ETSI TS 103 326 V1.1.1 (2015-04)10 5) Remove Npaddingbits from the last
45、 subpacket 6) Append the parity bits generated for each subpacket to each subpacket 7) Reassemble the expanded subpackets in the same order they were dissembled to produce the PSDU 7.3.3 BCH (36, 22, t=2) Encoding For error correction control of the Packet Length, PHY Scheme, and Reserved fields of
46、the PLCP header, a systematic BCH(36,22,t=2) code shall be employed. The BCH code is a shortened code derived from the primitive BCH (127, 113, t=2) described in clause 7.3.2. The encoding process is as follows: 1) Set Npadding= 91. 2) Append Npaddingzero bits to the end of the Packet Length, PHY Sc
47、heme, and Reserved fields, the resulting 113 bits are treated as a subpacket in clause 7.3.2. 3) Compute the parity bits for the subpacket using the generator polynomial g(x) in (1). 4) Remove Npaddingbits from the subpacket. 5) Append the generated parity bits to the subpacket. 7.4 Scrambling A dat
48、a scrambler can be used when necessary. The scrambling sequence is generated by the scrambling polynomial is 1 + x14+ x15, with an initial state of 000100100001010. The output of the data scrambler is: xn = xn-14xn-15. Figure 5 shows an implementation of the data scrambler. D denotes the delay opera
49、tion. Figure 5: Data scrambler 8 Other Requirements 8.1 Packet Length In this clause, we calculate the maximum permitted length of PPDUs and MPDUs. Figure 6: Channel Access Slot Structure Each time slot is partitioned into 2 transmission phases (TTXand TACK) and 2 or more transition phases. The time allocated to the initial transmission phase is dependent on several factors: Time for transmitting the Acknowledgement frame. D D D D D D D D D D D D D D D xn xn-1 xn-2 xn-3 xn-4 xn-5 xn-6 xn-7 xn-8 xn-9 xn-10 xn-11 xn-12 xn-13
