1. 802.16 Overview and Coexistence Aspects
November 18
doc.: IEEE / 0025
November 18
Overview and Coexistence Aspects
Date:
Authors:
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Jose Puthenkulam, Marianna Goldhammer
Jose Puthenkulam, Marianna Goldhammer

2. Outline Brief Overview of 802.16 standard Co-existence Overview
November 18
doc.: IEEE / 0025
November 18
Outline
Brief Overview of standard
Co-existence Overview
Jose Puthenkulam, Marianna Goldhammer
Jose Puthenkulam, Marianna Goldhammer

3. Connection Management Privacy & Key Management
November 18
Protocol Stack
Convergence Sub Layer IP
Ethernet
ATM
Packet Classifiers
Header Suppression
MAC Layer
Network Entry
PDU Generation
PDU Reassembly
Connection Management
BW Management
ARQ
Privacy & Key Management
PHY Burst Scheduling
Handoffs
Power Management
PHY Layers
Single Carrier
(10-66GHz & < 11 GHz)
OFDM-256 FFT
( < 11GHz)
OFDMA (2048,1024,512,128 FFT)
( < 11GHz)
(Scalable OFDMA)
Jose Puthenkulam, Marianna Goldhammer

4. 802.16-2004 vs 802.16e features November 18 Convergence Sub LayerIP
Ethernet
ATM
Packet Classifiers
Header Suppression
MAC Layer
Network Entry
PDU Generation
PDU Reassembly
Connection Managemt
BW Managemt
ARQ
Privacy & Key Management
(PK, EAP, AES, Multicast Security)
PHY Burst Scheduling
Handoffs
Power Managemt
(Sleep & Idle Modes)
PHY Layers
Single Carrier
(10-66GHz &
< 11 GHz)
OFDM-256 FFT (<11GHz) (AAS)
OFDMA ( < 11GHz)
2048 FFT mode, Subchannelization Schemes, H-ARQ, AAS, MIMO, STC
DL Subchannelization
1024,512,128 FFT modes and symbol structures, HARQ, MIMO, STC enhancements
IEEE
P802.16e (licensed only)
Jose Puthenkulam, Marianna Goldhammer

5. OFDM vs OFDMA OFDM Overall User 1 User 2 User 3 User 4 OFDMA Overall
November 18
OFDM vs OFDMA
OFDM
Clustered subcarrier allocation
Multipath diversity limited to the clusters
Overall
User 1
User 2
User 3
User 4
OFDMA
Permutated subcarriers allocation with permutation varying between cells
Inter-Cell Interference limited to only some subcarriers
Optimal for mobile channels
Overall
User 1
User 2
User 3
User 4
Jose Puthenkulam, Marianna Goldhammer

6. OFDMA Frame Structure (TDD) example
November 18
OFDMA Frame Structure (TDD) example
Jose Puthenkulam, Marianna Goldhammer

7. MAC PDU Format November 18
Each MAC PDU begins with a 6 bytes generic MAC header.
The payload information may vary in length.
SS has 48-bit IEEE MAC address (defined in IEEE Std. 802 – 2001)
BS has 48-bit base station ID (24 bits operator indicator)
Connections are identified by a 16-bit CID.
The maximum length of the MAC PDU is 2048 bytes, including header, payload, and cyclic redundancy check (CRC).
Jose Puthenkulam, Marianna Goldhammer

8. Generic MAC Header HT: header type EC: data encryption control
November 18
Generic MAC Header
HT: header type EC: data encryption control
ESF: extended subheader flag CI: CRC indicator
EKS: Encryption Key Sequence (index of traffic encryption key)
Jose Puthenkulam, Marianna Goldhammer

9. Network Entry Process November 18
Jose Puthenkulam, Marianna Goldhammer

10. 802.16 MAC Protocol Demand Slot Assignment Protocol
November 18
MAC Protocol
Demand Slot Assignment Protocol
Supports QoS Service Classes using Service Flows
Each Service Flow maintains a logical connection using a Connection Identifier (CID – 16 bits)
Subscriber Station (SS) ranges using Ranging Protocol that allows the SS to establish timing synchronization with BS
SS always request UL BW Request using MAC Messages
DL Channel Descriptors (DCD) and UL Channel Descriptors (UCD) are MAC messages used to convey the burst profile sets that are active
DL-MAP and UL-MAP MAC messages provide the burst allocation information
Jose Puthenkulam, Marianna Goldhammer

11. 802.16 DFS Operation Mandatory in LE bands
November 18
DFS Operation
Mandatory in LE bands
Requires BS and SS to support the following DFS procedures:
Testing channels for primary users
Discontinuing operations after detecting primary users
Detecting primary users
Scheduling for channel testing
Requesting and Reporting measurements
Selecting and advertising a new channel
Method used to detect is not specified and also RF band specific
Jose Puthenkulam, Marianna Goldhammer

12. 802.16 Transmit Power Control
November 18
Transmit Power Control
All PHY layers support transmit power control
SCa PHY Layer:
Monotonic Power Level Range : >= 30db; Min. Step size: 1db
OFDM-256 PHY Layer:
Monotonic Power Level Range: >= 30db; Min. Step size: 1db
OFDMA PHY Layer:
Monotonic Power Level Range : >= 45db; Min. Step size: 1db
LE bands: Monotonic Power Level Range : >= 30db; Min. Step size: 1db
Jose Puthenkulam, Marianna Goldhammer

13. 802.16-2004 MAC DFS Behavior In LE Bands
November 18
MAC DFS Behavior
In LE Bands
Once BS takes control of channel, it will release it only in the next channel testing cycle
No specification on channel testing except clause to meet regulatory requirements
As DC-11 GHz is within scope, there is lack of clear definition for consistent co-existence behavior
Hence h!
Jose Puthenkulam, Marianna Goldhammer

14. RF Coexistence info in 802.16-2004
November 18
RF Coexistence info in
License-exempt bands below 11GHz, duplexing: TDD
Power limits: defined by country-specific regulations
Channelization: 10 and 20MHz, on a 5MHz grid, from 5 to 6GHz
Spectral masks – according to local regulations or to a defined mask
ACI / alternate channel rejection: 11/30dB for 16QAM3/4
Jose Puthenkulam, Marianna Goldhammer

15. November 18
Spectral masks
Jose Puthenkulam, Marianna Goldhammer

16. Coexistence approach in 802.16h draft
November 18
Coexistence approach in h draft
MAC frames synchronization
Separation of interference in time domain
Based on scheduling
High capacity and QoS assurance
Fairness criteria
Radio master sub-frames for every system
Coexistence protocol
Control of interference levels
Distributed architecture
Technology independent approach
Communication at IP level
Other modes are proposed
Jose Puthenkulam, Marianna Goldhammer

17. References IEEE Standard 802.16-2004 IEEE Draft Standard P80216e/D9
November 18
References
IEEE Standard
IEEE Draft Standard P80216e/D9
IEEE Draft Standard P /Cor1/D3
80216h-05/013 – (802.16h working document)
Jose Puthenkulam, Marianna Goldhammer