WiMAX: Technology for Broadband Wireless Access

8.4 Basic, Primary and Secondary Management Connections

As already mentioned, connections are identified by a 16-bit CID. At SS initialisation, taking place at SS network entry, two pairs of management connections (uplink and downlink connections) are established between the SS and the BS, and a third pair of management connections may be optionally established. These three pairs of connections reflect the fact that there are three different levels of QoS for management traffic between an SS and the BS:

• The basic connection is used by the BS MAC and SS MAC to exchange short, time-urgent MAC management messages. This connection has a Basic CID (see Table 7.1).

  Table 8.5: List of all 802. 16-2004 MAC management messages. See Annex A for brief descriptions of each message. (From IEEE Std 802. 16-2004 ^[1]. Copyright IEEE 2004, IEEE. All rights reserved.)

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  Type	Message name	Description	Connection
  0	UCD	Uplink Channel Descriptor	Broadcast
  1	DCD	Downlink Channel Descripton	Broadcast
  2	DL-MAP	Downlink Access Definition	Broadcast
  3	UL-MAP	Uplink Access Definition	Broadcast
  4	RNG-REQ	Ranging Request	Initial ranging or basic
  5	RNG-RSP	Ranging Response	Initial ranging or basic
  6	REG-REQ	Registration Request	Primary management
  7	REG-RSP	Registration Response	Primary management
  8	reserved
  9	PKM-REQ	Privacy Key Management Request	Primary management
  10	PKM-RSP	Privacy Key Management Response	Primary management
  11	DSA-REQ	Dynamic Service Addition Request	Primary management
  12	DSA-RSP	Dynamic Service Addition Response	Primary management
  13	DSA-ACK	Dynamic Service Addition Acknowledge	Primary management
  14	DSC-REQ	Dynamic Service Change Request	Primary management
  15	DSC-RSP	Dynamic Service Change Response	Primary management
  16	DSC-ACK	Dynamic Service Addition Acknowledge	Primary management
  17	DSD-REQ	Dynamic Service Deletion Request	Primary management
  18	DSD-RSP	Dynamic Service Deletion Response	Primary management
  19	reserved
  20	reserved
  21	MCA-REQ	Multicast Assignment Request	Primary management
  22	MCA-RSP	Multicast Assignment Response	Primary management
  23	DBPC-REQ	Downlink Burst Profile Change Request	Basic
  24	DBPC-RSP	Downlink Burst Profile Change Response	Basic
  25	RES-CMD	Reset Command	Busic
  26	SBC-REQ	SS Basic Cupability Request	Basic
  27	SBC-RSP	SS Basic Capability Response	Basic
  28	CLK-CMP	SS network Clock Comparison	Broadcast
  29	DREG-CMD	De/Re-register Command	Basic
  30	DSX-RVD	DSx Received Message	Primary management
  31	TFTP-CPLT	Configuration File TFTP Complete Messate	Primary management
  32	TFTP-RSP	Configuration File TFTP Complete Response	Primary management
  33	ARQ-Feedback	Standalone ARQ Feedback	Basic
  34	ARQ-Discard	ARQ Discard message	Basic
  35	ARQ-Reset	ARQ Reset message	Basic
  36	REP-REQ	Channel measurement Report Request	Basic
  37	REP-RSP	Channel measurement Report Response	Basic
  38	FPC	Fast Power Control	Broadcast
  39	MSH-NCFG	Mesh Network Configuration	Broadcast
  40	MSH-NENT	Mesh Network Entry	Basic
  41	MSH-DSCH	Mesh Distributed Schedule	Broadcast
  42	MSH-CSCH	Mesh Centralised Schedule	Broadcast
  43	MSH-CSCF	Mesh Centralised Schedule Configuration	Broadcast
  44	AAS-FBCK-REQ	AAS Feedback Request	Basic
  45	AAS-FBCK-RSP	AAS Feedback Response	Basic
  46	AAS-Beam_Select	AAS Beam Select message	Basic
  47	AAS-BEAM_REQ	AAS Beam Request message	Basic
  48	AAS-BEAM_RSP	AAS Beam Response message	Basic
  49	DREG-REQ	SS De-registration Request message	Basic
  50–255	reserved

• The primary management connection is used by the BS MAC and SS MAC to exchange longer, more delay-tolerant MAC management messages. This connection has a Primary Management CID (see Table 7.1). Table 8.5 and 8.6 list all of the 802.16-2004 and 802.16e MAC management messages. See Annex A for brief descriptions of each message. Tables 8.5 and 8.6, specify which MAC management messages are transferred on each of these two connections.

  Table 8.6: MAC management messages added by the 802.16e amendment. (From IEEE Std 802.16e-2005 ^[2]. Copyright IEEE 2006, IEEE. All rights reserved.)

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  Type	Message name	Description	Connection
  50	MOB_SLP-REQ	SLeep REQuest	Basic
  51	MOB_SLP-RSP	SLeep ReSPonse	Basic
  52	MOB_TRF-IND	TRaffic INDiication	Broadcast
  53	MOB_NBR-ADV	Neighbour ADVertisement	Broadcast and primary management
  54	MOB_SCN-REQ	SCanning interval allocation REQuest	Basic
  55	MOB_SCN-RSP	SCanning interval allocation ReSPonse	Basic
  56	MOB_BSHO-REQBS	HO REQuest	Basic
  57	MOB_MSHO-REQ	MS HO REQuest	Basic
  58	MOB_BSHO-RSP	BS HO Response	Basic
  59	MOB_HO-IND	HO INDication	Basic
  60	MOB_SCN-REP	Scanning result REPort	Primary management
  61	MOB_PAG-ADV	BS broadcast PAGing	Broadcast
  62	MBS_MAP	MBSMA	MA
  63	PMC_REQ	Power control Mode Change REQuest	Basic
  64	PMC_RSP	Power control Mode Change Response	Basic
  65	PRC-LT-CTRL	Set-up/tear-down of Long-Term MIMO precoding	Basic
  66	MOB_ASC-REP	Association result REPort	Primary management
  67-255	reserved

• The secondary management connection is used by the BS and SS to transfer delay tolerant, standards-based messages. These standards are the Dynamic Host Configuraation Protocol (DHCP), Trivial File Transfer Protocol (TFTP), Simple Network Manageement Protocol (SNMP), etc. The secondary management messages are carried in IP datagrams, as mentioned later in Chapter 11 (see also Section 5.2.6 of the standard [I] for IP CS PDU formats). Hence, secondary management messages are not MAC mannagement messages. Use of the secondary management connection is required only for managed SSs.

An SS supports a Basic CID, a Primary Management CID and zero or more Transport CIDs. A managed SS also supports a Secondary Management CID. Then the minimum value of the number of uplink CIDs supported is three for managed SSs and two for unmanaged SSs.

The CIDs for these connections are assigned in the initial ranging process, where the three CID values are assigned. The same CID value is assigned to both members (uplink and downlink) of each connection pair. The initial ranging process is described in Chapter 11.