1、 ATIS-0700004.2007 HIGH CAPACITY SPATIAL DIVISION MULTIPLE ACCESS (HC-SDMA) RADIO INTERFACE STANDARD AMERICAN NATIONAL STANDARD FOR TELECOMMUNICATIONS The Alliance for Telecommunication Industry Solutions (ATIS) is a technical planning and standards development organization that is committed to rapi
2、dly developing and promoting technical and operations standards for the communications and related information technologies industry worldwide using a pragmatic, flexible and open approach. Over 1,100 participants from over 300 communications companies are active in ATIS 22 industry committees and i
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9、imer both are supported. An interconnection wide-area network (IWAN) interconnecting one or more PSSs with end-user service provider equipment. An L2TP network server (LNS) that terminates the end-user PPP sessions originating on the EUDs, providing authentication, authorization, accounting data col
10、lection, and COS enforcement. Figure 2 - Elements in a Typical HC-SDMA Deployment only includes those elements of a deployment relating to the flow of end-to-end user data. It does not include the many additional elements present in a complete deployment including platforms for network management, b
11、illing, provisioning, content delivery, and so forth. 1.4.3 User Data Transport End-user IP traffic is conveyed across an HC-SDMA deployment through a series of encapsulation/decapsulation steps as depicted in Figure 3 - End-user Traffic Encapsulation. An end-user PPP session bearing an IP header is
12、 created between an EUD and an LNS. Each peer-to-peer communication in the diagram is bi-directional and symmetric. End User Device IP PPP PHY IP PPP UDP/IP L2TP IWAN IPEthernetPSS (L2TP TunnelSwitch)UDP/IPL2TP TWANUDP/IP L2TP IWANMAC UT PHY MAC BSUDP/IPL2TP TWANLNSHC SDMA Protocol SpecificationFigu
13、re 3: End-user Traffic Encapsulation Data flows between the UT and the EUD using an encapsulating protocol appropriate to the physical connection between the two entities, generically referred to as the “MAC” and “PHY” layers in the figure. In the case of a USB interface, these are in fact the USB M
14、AC and PHY. Another example is an Ethernet connection, in which case the Ethernet MAC and PHY are used. Data flows between the UT and the BS over the HC-SDMA radio air interface. The UT decapsulates UT-originated traffic from the MAC/PHY encapsulation and then encapsulates it using the HC-SDMA air i
15、nterface encapsulation prior to transmitting it to the base station. The analogous operation is performed at the BS side for network-originated traffic bound for the UT. The HC-SDMA protocol specification provides details for the air interface which itself follows a layered protocol model. ATIS-0700
16、004.2007 8 1.5 Protocol Overview 1.5.1 Protocol Features HC-SDMA is designed for the efficient transport of broadband packet data to a large number of users. Key features of the air interface are as follows: TDMA/TDD channel structure. Efficient allocation of traffic resources in response to demand
17、and link conditions. Power control, tiered modulation and forward error control (FEC) to address different link conditions and UT capabilities. ARQ for reliable data delivery. Link-level encryption, BS and UT authentication to guarantee the confidentiality of both user and system control data. Link
18、and network layer handover procedures to ensure seamless continuity of end-user sessions as UTs traverse the access network. Ability to aggregate multiple 625 KHz carriers. Quality of Service (QOS) support. Intrinsic support for adaptive antenna (spatial) processing to achieve high data rates for ma
19、ny users within a cell and network. 1.6 Protocol Reference Model and Interfaces The HC-SDMA protocol follows a layered structure. For each layer the protocol specifies requirements for actions to be taken in response to and in service of adjoining layers. This layered structure is summarized in Tabl
20、e 1 - Protocol Layers in the HC-SDMA Reference Model. Table 1: Protocol Layers in the HC-SDMA Reference Model Layer Description L3 Specifications for creating and maintaining logical sessions including registration management, session management, resource control, mobility control, packet fragmentat
21、ion, slot aggregation, in-band messaging, and security. L2 Specifications for reliable transmission (RLC), medium access control (MAC), logical channel structure (BCH, PCH, TCH). L1 Specifications for channelization, burst structure, training data, modulation and FEC, timing. L0 (RF) RF specificatio
22、ns for communication over the air link including output power levels, transmit frequency and timing error, pulse shaping, in band and out of band spurious emissions, receiver sensitivity and selectivity, dynamic range. The HC-SDMA protocol does not provide specifications for applications layers beyo
23、nd Layer 3. ATIS-0700004.2007 9 The messaging and communication interfaces in this layered structure are summarized in Figure 4 - Sublayers and Interfaces in the HC-SDMA Protocol Reference Model. L3 CMConnection ManagementL3 RMRegistration ManagementL3 MMC - MobilityManagementand Control L3 RRC Radi
24、o Resource Control L2 RLCRadio LinkControlL2 MAC Media Access ControlL1L0 RFFigure 4: Sublayers and Interfaces in the HC-SDMA Protocol Reference Model 1.6.1 Layer 3 Protocol The Layer 3 protocol has a number of components with distinct roles in providing transport across the air interface. The compo
25、nents are named as follows: Layer 3 Connection Management (L3 CM); Layer 3 Registration Management (L3 RM); Layer 3 Mobility Management and Control (L3 MMC); and Layer 3 Radio Resource Control (L3 RRC). 1.6.1.1 L3 CM (Layer 3 Connection Management) This sublayer defines the top-level boundary of the
26、 HC-SDMA protocol. It provides management of the logical connection between the UT and BS across the air interface. L3 CM receives and sends control and data information to L3 RM. 1.6.1.2 L3 RM (Layer 3 Registration Management) This sublayer provides management between the virtual connections at L3
27、CM to physical connections (also known as streams) provided by L2 RLC. L3 RM sends (receives) acknowledged mode and unacknowledged mode control and data messages to (from) L2 RLC. L3 RM interfaces to L3 MMC to coordinate registration and deregistration during handovers. In addition, certain control
28、action primitives flow directly between L3 RM and L2 MAC. ATIS-0700004.2007 10 1.6.1.3 L3 MMC (Layer 3 Mobility Management and Control) This sublayer, which exists only at the UT, provides management and control for mobility functionality in the protocol stack. It interfaces to L1 to gather requisit
29、e information such as signal levels from various base stations in order to provide the mobility control function to L3 RM. This sublayer is also responsible for tracking frame timing and frequency offset of the user terminals. 1.6.1.4 L3 RRC (Layer 3 Radio Resource Control) This sublayer interfaces
30、to L1 and to L2 MAC in order to coordinate power control and link adaptation necessary to maintain an RF link. 1.6.2 Layer 2 Protocol The Layer 2 protocol has two components, L2 RLC and L2 MAC, which control and manage the presentation of reliable streams to L3. 1.6.2.1 L2 RLC (Layer 2 Radio Link Co
31、ntrol) This sublayer provides reliable acknowledge mode (AM) and unreliable unacknowledged mode (UM) peer to peer message delivery services to L3 RM over the L2 MAC sublayer. 1.6.2.2 L2 MAC (Layer 2 Medium Access Control) This sublayer provides highly dynamic access management and control functions
32、to map and transport logical control and traffic data over various L1 burst types. L2 MAC dynamically controls access to the air interface resources and maps data and control onto these resources available at any time. 1.6.3 Layer 1 Protocol The Layer 1 protocol enforces the slot and frame structure
33、, modulation and coding, and training sequences necessary for transport of bits over the L0 (RF) interface. 1.6.4 Layer 0 Protocol The L0 (RF) protocol enforces the RF characteristics of receivers and transmitters in the system including output power levels, transmit frequency and timing error, puls
34、e shaping, in band and out of band spurious emissions, receiver sensitivity, selectivity, and dynamic range. 1.7 Normative References The following normative references are used within this standard: ITU-T Recommendation Z.120, Message Sequence Charts (MSC); available from the International Telecomm
35、unications Union at . RFC 1662, PPP in HDLC-like Framing; available at . See also clause 11A for references concerning Privacy and Authentication ATIS-0700004.2007 11 2 SPECTRAL LAYOUT TERMINOLOGY AND REQUIREMENTS 2.1 Overview This section defines concepts and specifies requirements for spectral pla
36、nning in a HC-SDMA network. 2.1.1 Definitions for Basic HC-SDMA Networks 2.1.1.1 Network Related Defintions 2.1.1.1.1 Basic HC-SDMA Networks A basic HC-SDMA network is a wireless communications system operating in accordance with the HC-SDMA protocol in a contiguous set of TDD spectrum (up to 10 MHz
37、 wide) with an HC-SDMA control channel. Basic networks may be combined into compound HC-SDMA networks (see 2.1.1.1.4, Compound Networks). 2.1.1.1.2 Carrier Allocation The carrier allocation is the specific set of RF carrier frequencies on which the basic HC-SDMA network operates. (A BS in a basic HC
38、-SDMA network is not required to support every carrier in the basic network carrier allocation.) 2.1.1.1.3 Frequency Origin and Carrier Numbering The lowest-frequency carrier for a basic HC-SDMA network is called the frequency origin (forg). Carriers in the carrier allocation are numbered sequential
39、ly from zero, starting with the frequency origin. The RF carrier frequency numbering is the same for every base station (BS) and user terminal (UT) operating in a basic HC-SDMA network. 2.1.1.1.4 Compound Networks A compound HC-SDMA network is the combination of several basic HC-SDMA networks with d
40、isjoint carrier allocations. A particular BS may support more than one basic network within a compound network. 2.1.1.2 Base Station Related Definitions 2.1.1.2.1 Carrier Set A carrier set is a contiguous subset of the basic network carrier allocation that a particular BS may use to support traffic
41、in the basic network. Carrier sets may vary from BS to BS while the basic network carrier allocation remains fixed. 2.1.1.2.2 Relative Carrier Number and Base Carrier Carriers in a carrier set can be identified by their relative carrier number. The relative carriers are numbered sequentially starting from 0.
