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AIR INTERFACE FOR FIXED BROADBAND WIRELESS ACCESS SYSTEMS

IEEE Std 802.16-2001

6.2.2.3.4 Uplink Map (UL-MAP) message

The UL-MAP message allocates access to the uplink channel. The UL-MAP message shall be as shown in Table 17.

Table 17—UL-MAP message format

Syntax

Size

Notes

 

 

 

UL-MAP_Message_Format() {

 

 

 

 

 

Management Message Type = 3

8 bits

 

 

 

 

Uplink Channel ID

8 bits

 

 

 

 

UCD Count

8 bits

 

 

 

 

Number of UL-MAP Elements n

16 bits

 

 

 

 

Allocation Start Time

32 bits

 

 

 

 

Begin PHY Specific Section {

 

See applicable PHY section.

 

 

 

for (i = 1; i <= n; i++) {

 

For each UL-MAP element 1 to n.

 

 

 

UL_MAP_Information_Element()

Variable

See corresponding PHY specification.

 

 

 

}

 

 

 

 

 

}

 

 

 

 

 

}

 

 

 

 

 

The BS shall generate the UL-MAP with the following parameters:

Uplink Channel ID

The identifier of the uplink channel to which this Message refers.

UCD Count

Matches the value of the Configuration Change Count of the UCD which describes the uplink burst profiles which apply to this map.

Number of Elements

Number of information elements in the map.

Alloc Start Time

Effective start time of the uplink allocation defined by the UL-MAP in units of minislots.

Map Information Elements

Each Information Element (IE) consists of at least three of the following fields:

1)Connection Identifier (CID)

2)Uplink Interval Usage Code (UIUC)

3)Offset

IEs define uplink bandwidth allocations. Each UL-MAP message shall contain at least one IE that marks the end of the last allocated burst. The IEs shall be in strict chronological order within the UL-MAP.

The CID represents the assignment of the IE to either a unicast, multicast, or broadcast address. When specifically addressed to allocate a bandwidth grant, the CID shall be either the Basic CID of the SS or a

Copyright © 2002 IEEE. All rights reserved.

49

IEEE Std 802.16-2001

LOCAL AND METROPOLITAN AREA NETWORKS—PART 16:

Transport CID for one of the connections of the SS. An UIUC shall be used to define the type of uplink access and the uplink burst profile associated with that access. An Uplink_Burst_Profile shall be included in the UCD for each UIUC to be used in the UL-MAP.

6.2.2.3.5 Ranging Request (RNG-REQ) message

An RNG-REQ shall be transmitted by the SS at initialization and periodically on the request of the BS to determine network delay and to request power and/or downlink burst profile change. The format of the RNG-REQ message is shown in Table 18. The RNG-REQ message may be sent in Initial Maintenance and Station Maintenance intervals.

Table 18—RNG-REQ message format

Syntax

Size

Notes

 

 

 

RNG-REQ_Message_Format() {

 

 

 

 

 

Management Message Type = 4

8 bits

 

 

 

 

Downlink Channel ID

8 bits

 

 

 

 

Pending Until Complete

8 bits

 

 

 

 

TLV Encoded Information

Variable

TLV specific

 

 

 

}

 

 

 

 

 

The CID field in the MAC header shall assume the following values when sent in an Initial Maintenance interval:

a)Initial ranging CID if SS is attempting to join the network.

b)Initial ranging CID if SS has not yet registered and is changing downlink (or both downlink and uplink) channels as directed by the downloaded SS Configuration File (9.2).

c)Basic CID (previously assigned in RNG-RSP) if SS has not yet registered and is changing uplink channel as directed by the downloaded SS Configuration File (9.2).

d)Basic CID (previously assigned in RNG-RSP) if SS is registered and is changing uplink channel.

e)In all other cases, the Basic CID is used as soon as one is assigned in the RNG-RSP message.

If sent in a Station Maintenance interval, the CID is always equal to the Basic CID.

The parameters described below are present in the RNG-REQ message. Note that the length of the RNG-REQ message sent in an Initial Maintenance Interval is fixed, containing all of its TLVs.

Downlink Channel ID

The identifier of the downlink channel on which the SS received the UCD describing the uplink on which this ranging request message is to be transmitted. This is an 8-bit field.

Pending Until Complete

If zero, then all previous Ranging Response attributes have been applied prior to transmitting this request. If nonzero, then this is time estimated to be needed to complete assimilation of ranging parameters. Units are in unsigned centiseconds (10 ms).

All other parameters are coded as TLV tuples as defined in 11.1.3.

50

Copyright © 2002 IEEE. All rights reserved.

AIR INTERFACE FOR FIXED BROADBAND WIRELESS ACCESS SYSTEMS

IEEE Std 802.16-2001

The following parameters shall be included in the RNG-REQ message:

Requested Downlink Burst Profile

SS MAC Address

Ranging Anomalies

6.2.2.3.6 Ranging response (RNG-RSP) message

A RNG-RSP shall be transmitted by the BS in response to received RNG-REQ or to send corrections based on measurements that have been done on other received data or MAC messages. From the point of view of the SS, reception of a RNG-RSP is stateless. In particular, the SS shall be prepared to receive an RNG-RSP at any time, not just following a RNG-REQ.

The initial RNG-RSP Message should be transmitted using a downlink burst profile that is sufficiently robust to provide for adequate reception.

To provide for flexibility, the Message parameters following the Uplink Channel ID shall be encoded in a TLV form.

A BS shall generate RNG-RSPs in the form shown in Table 19, including all of the following parameters:

Uplink Channel ID

The identifier of the uplink channel on which the BS received the RNG-REQ to which this response refers. This is an 8-bit quantity.

All other parameters are coded as TLV tuples, as defined in 11.1.4.

Table 19—RNG-RSP message format

Syntax

Size

Notes

 

 

 

RNG-RSP_Message_Format() {

 

 

 

 

 

Management Message Type = 5

8 bits

 

 

 

 

Uplink Channel ID

8 bits

 

 

 

 

TLV Encoded Information

Variable

TLV specific

 

 

 

}

 

 

 

 

 

The following parameters shall be included in the RNG-RSP message:

Timing Adjust Information

Power Adjust Information

Frequency Adjust Information

Ranging Status

Copyright © 2002 IEEE. All rights reserved.

51

IEEE Std 802.16-2001

LOCAL AND METROPOLITAN AREA NETWORKS—PART 16:

The following parameters may be included in the RNG-RSP message:

Downlink Frequency Override

Uplink Channel ID Override Downlink Operational Burst Profile Basic CID

A required parameter if the RNG-RSP message is being sent on the Initial Ranging CID in response to a RNG-REQ message that was sent on the Initial Ranging CID.

Primary Management CID

A required parameter if the RNG-RSP message is being sent on the Initial Ranging CID in response to a RNG-REQ message that was sent on the Initial Ranging CID.

SS MAC Address (48-bit)

A required parameter when the CID in the MAC header is the Initial Ranging CID.

6.2.2.3.7 Registration Request (REG-REQ) message

An REG-REQ shall be transmitted by an SS at initialization. An SS shall generate REG-REQs in the form shown in Table 20.

Table 20—REG-REQ message format

Syntax

Size

Notes

 

 

 

REG-REQ_Message_Format() {

 

 

 

 

 

Management Message Type = 6

8 bits

 

 

 

 

TLV Encoded Information

Variable

TLV Specific

 

 

 

}

 

 

 

 

 

An SS shall generate REG-REQs including the following parameters:

Primary Management CID (in the Generic MAC Header)

The CID in the Generic MAC Header is the Primary Management CID for this SS, as assigned in the RNG-RSP message.

All other parameters are coded as TLV tuples.

The REG-REQ shall contain the following TLVs:

HMAC Tuple (see 11.4.10)

Uplink (UL) CID Support (see 11.4.1.1)

The REG-REQs may contain the following TLV parameters stored in or generated by the SS:

Vendor ID Encoding (of the SS; see 11.4.3)

SS Capabilities Encodings (excluding UL CID support, physical parameters supported, and bandwidth allocation support) (see 11.4.1)

6.2.2.3.8 Registration Response (REG-RSP) message

A REG-RSP shall be transmitted by the BS in response to received REG-REQ.

52

Copyright © 2002 IEEE. All rights reserved.

AIR INTERFACE FOR FIXED BROADBAND WIRELESS ACCESS SYSTEMS

IEEE Std 802.16-2001

To provide for flexibility, the message parameters following the response field shall be encoded in a TLV format.

Table 21—REG-RSP message format

Syntax

Size

Notes

 

 

 

REG-RSP_Message_Format() {

 

 

 

 

 

Management Message Type = 7

8 bits

 

 

 

 

Response

8 bits

 

 

 

 

TLV Encoded Information

Variable

TLV specific

 

 

 

}

 

 

 

 

 

A BS shall generate REG-RSPs in the form shown in Table 21, including both of the following parameters:

CID (in the Generic MAC Header)

The CID in the Generic MAC Header is the Primary Management CID for this SS.

Response

A one-byte quantity with one of the two values: 0 = OK

1 = Message authentication failure

The following parameters shall be included in the REG-RSP:

MAC Version (see 11.4.4)

Secondary Management CID

Hashed message authentication code (HMAC) Tuple

The following parameter shall be included in the REG-RSP if found in the REG-REQ or if the BS requires the use of a non-default value:

SS Capabilities (see 11.4.1)

The BS response to the capabilities of the SS (only if present in the REG-REQ). The BS responds to the SS capabilities to indicate whether they may be used. If the BS does not recognize an SS capability, it shall return this as “off” in the REG-RSP.

Capabilities returned in the REG-RSP shall not be set to require greater capability of the SS than is indicated in the REG-REQ, as this is the handshake indicating that they have been successfully negotiated.

The following parameter may be included in the REG-RSP:

Vendor ID Encoding (of the BS; see 11.4.3)

The following parameter may be included in the REG-RSP if the REG-REQ contained the Vendor ID Encoding for the SS:

Vendor-specific extensions (see 11.4.11)

Copyright © 2002 IEEE. All rights reserved.

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