IEEE 802.16S-2017 pdf free.IEEE Standard for Air Interface for Broadband Wireless Access Systems Amendment 4: Fixed and Mobile Wireless Access in Channel Bandwidth up to 1.25 MHz.
In%erl the following definitions us alphabetical order:
adjacent subcarricr permutation: A permutation scheme in which symbol data within a subchannel is assigned to adjacent subcarriers and where the pilot and data subcarriers are assigned fixed positions in the frequency domain within an orthogonal frequency division multiple access (OFDMA) symbol.
band ANIC: A permutation scheme in which the entire channel is split into groups of contiguous subcarricrs.
Change the first paragraph shown:
The MAC header formats are defined in Table 6- 1 except for the MAC header formats for DL-MAP and UL-MAP MAC messages for channel bandwidth less than 1.25 MHz. in which case the MAC header formats are defined in 6.3.2.1.1.2.
6.3.2.1.1.1 Relay MAC header format
Insert the following nen subclause, 6.3.2.1.1.2, including Figure 6-4a and Figure 6-4b, after 6.3.2.1.1.1:
6.3.2.1.1.2 Generic MAC header format for DL-MAP and UL -MAP MAC messages when channel bandwidth is less than 1.25 MHz
The header of the DL-MAP MAC message shall be of the format defined in Figure 6-4a. The DL-MAP is always the first burst in the DLSF so it can be identified as DL-MAP by its position in the burst. Therefore only LEN and HCS fields are transmitted. The modified GMAC header consists of 1 byte length field and 1 byte for HCS field.
The header of the UL-MAP MAC message shall be of the format defined in Figure 6-4b. The UL-MAP, if present, is the first data burst in the DLSF after DL-MAP, but it may not always be present in a frame, in which case the first burst may carry data traffic. Conflict will be avoided by setting HT = 1 to identify the burst as UL-MAP.Figure 6-4b- Modified UL -MAP header for channel bandwidths less than 1.25 MHz
6.3.2.3 MAC management messages
Change thefirst paragraph as shown:
A set of MAC management messages are defined. These messages shall be carried in the Payload of the MAC PDU. AIll MAC management messages except for DL-MAP and UL-MAP messages for channel bandwidth less than 1.25 MHz begin with a Management Message Type field and may contain additional fields. MAC management messages on the basic, broadcast, and initial ranging connections shall be neither fragmented nor packed. MAC management messages on the primary management connection may be packed and/or fragmented. MAC management messages on the fragmentable broadcast connection may be fragmented. For the OFDM, and OFDMA PHYs, management messages carried on the initial ranging, broadcast, fragmentable broadcast, basic, and primary management connections shall have CRC usage enabled. The format of the management messages except for DL -MAP and UL-MAP messages for channel bandwidth less than 1.25 MHz is given in Figure 6-27. The DL-MAP and UL -MAP MAC messages for channel bandwidth less than. 1.25 MHz do not include a management type field. The encoding of the Management Message Type field is given in Table 6-51. MAC management messages shall not be carried on transport conections. MAC management messages that have a Type value specified in Table 6-51 as reserved, or those not containing all required parameters or containing erroneously encoded parameters,shall be silently discarded. In case of MAC management messages with multiple presentations of the same TLV and/or encoded parameter information, the last presentation shall be used, unless otherwise specified that multiple presentations are allowed (e.g., Downlink_ Burst_ Profile TLV in DCD message), in which case all presentations shall be used.IEEE 802.16S pdf download.