ANSI ATIS 0700001-2004 MCSB Physical MAC LLC & Network Layer Specification C Multi-Carrier Synchronous Beamforming (MCSB) Air Interface.pdf

1、 AMERICAN NATIONAL STANDARD FOR TELECOMMUNICATIONS ATIS-0700001.2004(R2009) MCSB Physical, MAC/LLC, their existence does not in any respect preclude anyone, whether he has approved the standards or not, from manufacturing, marketing, purchasing, or using products, processes, or procedures not confor

2、ming to the standards. The American National Standards Institute does not develop standards and will in no circumstances give an interpretation of any American National Standard. Moreover, no person shall have the right or authority to issue an interpretation of an American National Standard in the

3、name of the American National Standards Institute. Requests for interpretations should be addressed to the secretariat or sponsor whose name appears on the title page of this standard. CAUTION NOTICE: This American National Standard may be revised or withdrawn at any time. The procedures of the Amer

4、ican National Standards Institute require that action be taken periodically to reaffirm, revise, or withdraw this standard. Purchasers of American National Standards may receive current information on all standards by calling or writing the American National Standards Institute. Notice of Disclaimer

5、 L2, Data Link Layer; L3, Network Layer; L4, Transport Layer; L5, Session Layer; L6, Presentation Layer; L7, Application Layer. PC Power Control The 5-bit field indicating levels of power control for the Access Terminal. PCS Partial Control Signal A control signal basic traffic packet field of conse

6、cutive voice basic traffic packets for one call. (An alternate use is Personal Communication Service, which is not used in this document.) PDU Protocol Data Unit Information that is delivered as a unit among peer entities of a system and that may contain control information, address information, or

7、data. PER Packet Error Rate The ratio between the number of packets received incorrectly and the total number of packets in the transmission. PN Pseudo-Noise Pseudo Random Binary Sequence Generator Pseudo Noise. A Pseudo Random Binary Sequence Generator is a commonly used method of generating a bina

8、ry sequence (logic 1s and 0s) which has a noise like spectrum. POTS Plain Old Telephone Service Refers to the standard telephone service that most homes use The POTS network is also called the public switched telephone network (PSTN). PPPoE Point-to-point Protocol Over Ethernet A protocol that allow

9、s dial-up Internet connections. Includes the Link Control Protocol as well as Network Control Protocols. PSK (Q)PSK (8)PSK (D)PSK Phase Shift Keying Digital transmission term that means an angle modulation where the phase of the carrier varies in relation to a reference - PSK - or former phase - Dif

10、ferential PSK (DPSK). Each change of phase carries one bit of information, where the bit rate equals the modulation rate. For example, Quadrature PSK (QPSK) carries two bits of information and 8PSK would carry three bits of information. PSN Packet Sequence Number The Packet Sequence Number is a mech

11、anism to used to assemble and re-assemble data packets. QAM Quadrature Amplitude Modulation A bandwidth conservation process routinely used in modems. Creates higher throughput but decreased coverage area. QoS Quality of Service A guaranteed throughput for critical network applications, such as Voic

12、e over IP. Term primarily used in an ATM environment - i.e., Class 1 Video; Class 2 Audio; Class 3 Data Connection. RADIUS Remote Authentication Dial In User Service An authentication and accounting system used by many Internet Service When accessing a ISP network the customers username and password

13、 is passed to a RADIUS server, which checks that the information is correct, and then authorizes access to the ISP system. ATIS-0700001-2004 6 Term Stands for. Meaning RAS Remote Access Server A server that is dedicated to handling users that are not on a Network but need remote access to it. The re

14、mote access server allows users to gain access from a remote location. RF Radio Frequency A portion of the electromagnetic spectrum in the frequency range between audio and infrared: 100 KHz to 20 GHz. RF measurements are expressed in Hz (unit for measuring frequency); MHz = 1 Million Hz; GHz = 1 Bi

15、lling Hz. RS Reed-Solomon Reed-Solomon codes are block-based error correcting codes with a wide range of applications in digital communications. RTP Real-time Transfer Protocol? An Internet protocol for transmitting real-time data such as audio and video. SNMP Simple Network Management Protocol Stan

16、dard management request-reply protocol for managing TCP/IP networks. A device is said to be SNMP compatible if it can be monitored or controlled using SNMP messages. SNR Signal-to-noise Ratio A measurement of the intended signal being transmitted against the other entities that can interfere with th

17、e signal. SONET Synchronous Optical Network A standard for connecting fiber-optic transmission systems. SRP Selective Retransmission Protocol A method of selectively re-transmitting error MAC packets SS Synchronization Shift A method to indicate how much time the Access Terminal shall adjust its tra

18、nsmitting time to synchronize with other terminals in the System. SYNC Synchronous Digital packets or signals that are sent at the same, precisely clocked fixed rate of speed. TCC Traffic Code Channel A portion of a radio channel used to enable transmission of one direction of a digitized voice or d

19、ata (Forward F-TCC for Reverse R-TCC). TCP Transport Control Protocol A standardized transport protocol between IP-based network nodes that allows two hosts to establish a connection and exchange streams of data. TCP operates on top of Internet Protocols and handles the multiplexing of sessions, err

20、or recovery, reliability and flow. It guarantees packets are delivered in the same order in which they were sent. TCP/IP Transport Control Protocol/Internet Protocol A set of protocols that allow cooperating computers to share resources across the network. TCP provides the reliability in the transmi

21、ssion, while IP provides connectionless packet service. TDD Time Division Duplex A digital transmission method that combines signals from multiple sources and allows a single channel to alternately carry data in each direction of a link. TFTP Trivail File Transfer Protocol A TCP/IP method consisting

22、 of a client and server and used to transfer files between two or more sites or elements in a network. ToS Type of Service A bit-pattern in each TCP packet, in the IPv4 TOS octet or the IPv6 Traffic Class octet, is used to mark a packet to receive a particular forwarding treatment, or per-hop behavi

23、or, at each network node. UDP User Datagram Protocol A communications protocol that offers a limited amount of service when messages are exchanged between computers in a network that uses the Internet Protocol (IP). UDP is an alternative to the Transmission Control Protocol (TCP.) UHF Ultra-high Fre

24、quency Frequency between 300MHz - 3 GHz in the electromagnetic radiation spectrum. ATIS-0700001-2004 7 Term Stands for. Meaning USB Universal Serial Bus An external bus standard for plug-and-play interfaces between a computer and add-on devices, such as a mouse, modem, keyboard, etc. One USB port ca

25、n connect up to 127 devices. VC Virtual Channel A group of channels to make up one logical channel. VCC Virtual Channel Circuit AKA, Virtual Channel Connection or Virtual Circuit Connection. A logical circuit made up of Virtual Channel Links, which carry data between two end points in an ATM network

26、. V/D/C Voice/Data/Ciruit-switched Indicates a make-up of all traffic groups.Walsh Code Walsh CodeAlgorithm that generates statistically unique sets of numbers for use in CDMA communications.WAN 1Wide Area Network or 2Wireless Access Network 1A communications network that spans geographically separa

27、te areas and which provides long-haul services. General term for any product primarily used to gain access to the Internet, as opposed to being part of the actual Internet devices or software. 1.2 MCSB - General Description MCSB shall be defined at the first three layers of the networking protocol s

28、tack (Figure 1): Layer 1 - Physical Layer 2 - Data Link Layer 3 - Network Figure 1 - MCSB Layers 1.3 MCSB Air Interface Protocol Layers 1.3.1 Physical Layer Overview The physical layer defines the modulation, multiplexing, Time Division Duplexing (TDD) framing, power control, and timing synchronizat

29、ion. It treats both circuit-switched and packet-switched data in the same way. ATIS-0700001-2004 8 1.3.2 Data Link Layer Overview The Data Link Layer contains two sub-layers: Media Access Control layer (MAC layer) and Logic Link Control layer (Link layer). The MAC layer is responsible for channel as

30、signment, reassignment, release, and processing of data packets. The Logic Link Control layer processes both circuit-switched and packet-switched data. The Logic Link Control for circuit-switching packs and unpacks the control signal packets, processes them, and sets up the voice connection with an

31、appropriate vocoder channel. The Logic Link Control for packet-switching implements the data framing and the Selective Retransmission Protocol (SRP). 1.3.3 Network Layer Overview The Network Layer performs packet classification/prioritization, Ethernet bridging, and Operation, Administration, and Ma

32、intenance (OAM) messaging, and is the interface to the core network. 2 MCSB AIR INTERFACE PHYSICAL LAYER 2.1 General This clause describes the MCSB Physical Layer structure. 2.2 System Frequency of Operation 2.2.1 Channel numbering and frequencies MCSB is capable of operation in any frequency band.

33、RF frequency = starting frequency of the band + n * 0.05; (where 0.05 is the frequency raster expressed in MHz) Where the RF frequency is given in MHz, n is the channel index: n = 0, 1, 2, maximum raster value in the band of operation - for example, in the 2.5GHz band (MMDS) n = 0 thru 3720, equival

34、ent to 186MHz. 2.2.2 Duplex operation The MCSB shall utilize Time Division Duplex. 2.3 TDD Frame Structure (System Timing) 2.3.1 System timing with respect to GPS timing All BTS transmissions shall be referred to a common system timing that is synchronized to Global Positioning System (GPS) timing,

35、as shown in Figure 2. ATIS-0700001-2004 Figure 2 - System Timing Where T = Period of TDD clock = 1/25.6 MHz = 39.0625 ns. t1= TDD synchronization signal offset. T1 = n*C, n can be any integer from 0 to 32. C is the chip duration = 64T = 2.5 s. 2.3.2 Timing tolerance The absolute system timing error

36、shall be +/-200ns (deviated from GPS timing). 2.4 Time Division Duplexing 2.4.1 TDD timing synchronization The BTS transmit and receive shall be synchronized to the system timing as shown in Figure 3. Figure 3 - TDD Timing 2.4.2 Frame structure The TDD frame structure is shown in Figure 4. The frame

37、 period shall be 10ms, and the total number of symbols, including uplink and downlink, shall be 125. Figure 4 - TDD Frame Structure 9 ATIS-0700001-2004 F-SYNC A downlink synchronization sequence that is transmitted in an omni-directional or predetermined pattern by the Base Station. F-SYNC is define

38、d in clause 2.8.1.6. REF This shall be a one-symbol field to serve as a reference symbol for differential demodulation. Forward/Reverse traffic This field contains the traffic information. GUARD It is the guard time between uplink and downlink. A four symbol (4s) guard time shall be reserved after t

39、he downlink and before the uplink. A one symbol (s) guard time shall be reserved after uplink and before the downlink. SYNC1 Transmitted by a terminal seeking uplink synchronization and random access. Reference 2.8.2.3. SYNC2 Shall be transmitted by a terminal that has been on the TCC channel to mai

40、ntain uplink synchronization with the Base Station. It also will serve the purpose of channel identification. Reference 2.8.2.4. n This shall be an integer from 0 to 7. As a minimum, n=0 (symmetric mode) and n=4 (Forward: Reverse=3:1 ratio) shall be supported. 2.4.3 TDD symmetry broadcast The symmet

41、ry setting of the TDD frame shall be broadcast in the two middle symbols of the forward SYNC. (Figure 5 and Table 1). Figure 5 - Symbols in the Forward SYNC Table 1 - Mapping Between S2, S3, and TDD Symmetry S2 S3 Symmetry setting 00 00 n=0 symmetry 00 01 n=1 (see previous clause for the definition

42、of n) 00 10 n=2 00 11 n=3 01 00 n=4 01 01 n=5 01 10 n=6 01 11 n=7 2.5 Physical Channel Overview There shall be a total of five forward physical channels and 4 reverse physical channels, as shown in Figure 6. 10 ATIS-0700001-2004 Figure 6 - Physical Channels 2.6 Mapping Between Physical & Basic Code

43、Channels (Walsh Codes) 2.6.1 Mapping among forward physical channels and basic code channels The Mapping shall be per Figure 7. 2.6.1.1 Sync The sync shall be mapped to Walsh code 1, the only active Walsh code in the sync period. 2.6.1.2 Forward Access Code Channel The Forward Access Code Channel (F

44、-ACC) shall be mapped to Walsh 1 in the ACC/Traffic Code Channel (TCC) period in sub-carriers 1, 3, 5, 7, and 9. 2.6.1.3 Forward Static BCC The Forward Static Broadcast Code Channel (F-SBCC) shall be mapped to Walsh 1 in the ACC/TCC period if it is unprovisioned. It is mapped to Walsh 2 if it is pro

45、visioned. It shall exist only on sub-carriers 1, 3, 5, 7,and 9. 11 ATIS-0700001-2004 2.6.1.4 Forward Dynamic BCC The Forward Dynamic BCC (F-DBCC) shall be mapped to any unoccupied Walsh codes in the TCC/ACC period. 2.6.1.5 Forward Traffic Code Channel The Forward TCC (F-TCC) shall be mapped to any W

46、alsh code in the TCC/ACC period except for Walsh codes used by ACC/BCC. Figure 7 - Forward Code Channel Map 2.6.2 Mapping among reverse physical channels and basic code channels The Mapping shall be per Figure 8. 2.6.2.1 Reverse Sync 1 Reverse Sync 1 (Sync 1) shall be mapped to Walsh code 1 in the a

47、ccess period. 2.6.2.2 Reverse Sync 2 Reverse Sync 2 (Sync 2) shall be a special training sequence (cyclic Pseudo-random Noise, or PN). 12 ATIS-0700001-2004 2.6.2.3 Reverse ACC Reverse ACC (R-ACC) shall be mapped to Walsh 1 in the ACC/TCC period. 2.6.2.4 Reverse TCC Reverse TCC (R-TCC) shall be mappe

48、d to any Walsh code in the ACC/TCC period except Walsh codes used for ACC. Figure 8 - Reverse Code Channel Map 2.7 Concatenation of physical channels When more than one physical channel is required to support high data rates, multiple physical channels shall be concatenated to form one large virtual

49、 channel. There shall be two concatenation approaches: Horizontal and Vertical. 2.7.1 Horizontal In horizontal concatenation, the traffic data shall be arranged on a physical channel along the time axis first (from 1 to 55s+n*7s), where n = value 0 to 7 defining the degree degree of asymmetry (Reference 2.4.2) and then warped back and the next physical channel filled in with continuous Walsh indices (Figure 9) 13 ATIS-0700001-2004 Figure 9 - Horizontal Physical Channel Concatenation 2.7.2 Vertical In vertical concatenation, the traffic